Posts Tagged ‘the’

D. cunninghami

Sunday, March 22nd, 2009

D. cunninghami is not often found in cultivation but it represents an attractive growing habit which is not difficult to cater for in a cool greenhouse.

The more typical elongated but plump pseudobulbs have here been reduced to thin stems which branch and rebranch, each stem clothed in thin, narrow leaves until the whole plant becomes a loose bundle of stems and leaves. Lacking the rigidity to grow upright the plant forms a pendent green shower, ideally fitted to a cooler climate which. experiences high winds.

In cultivation it is ideally suited to culture on bark. Occasionally losing a few leaves, which arc not missed, it is an evergreen which can be regularly sprayed throughout the year, and not given the completely dry resting period of the Asian species.

The thin, diminutive pseudobulbs carry little food reserves and would not sustain the plant through any lengthy period of drought, although in extreme seasons the soft leaves would quickly be shed to help the plant.

They grow from a fleshy horizontal rhizome which lies on the ground. Their plants form a rosette of leaves and bloom from the centre upon maturity of the growth. The glistening beauty of the leaves can be a deep velvety green, copper or mauve, laced with gold or silver threads.

These tiny plants are mostly all leaves, as can be seen in the :o p plant (above), Ornithocephalis iridefolius. This is a fully mature plant which produces a fan of leaves with the flower spikes in between the leaves. Our lower plant is Pleurothallis stellis, a typical member of a large genus which has short stems and single leaves. Both plants come from tropical America.

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Decorating Container Houseplant

Monday, March 16th, 2009

Employ a deeper container filled with moist peat. Plants do particularly well in such containers if the pot is plunged to the rim in the peat. The individual requirements of each plant can then be checked.

Growing plants in a group. These to my mind are by far the best purchase, as there is little doubt that plants do very much better if grown in the company of other plants. When taking my first steps, as it were, into the mysteries of growing pot plants a hardened old nurseryman once informed me t hat his plants did very much better when grown in a group. At the time I suppose an amused smile creased my face, but since then the sight of poorly plants making an indifferent job of growing in splendid isolation has given me cause to recall his remark with less amusement.

This in itself makes it a very fine plant for exhibition work, and it is especially useful and attractive when incorporated with blue saintpaulias. On the nursery no one was very keen to be given charge ofgreenhouses containing D. Pia, as the chances of success were not particularly good.

A third method of growing plants in a container is to fill the box or trough with a standard house plant potting compost and, removing the plants from their pots, plant them up more or less permanently in the mixture. To simplify the operation it is wise to arrange the plants in their probable positions on top of the compost before doing the planting. Very few of the larger containers are equipped with drainage holes in the base, so it is of the utmost importance to ensure that it is not overwatered.

When adopting this method it is important to choose plants for grouping together which are reasonably compatible in their moisture requirements, as they will all have to suffer or enjoy the same conditions. For example, the moisture-loving cyperus would not be expected to do particularly well in the same container as a sanscvicria which prefers very much dryer root conditions.

Thereafter they produced young plants at the base of the parent stem and the original plant gradually deteriorated, which is common to all the dieffenbachias that are likely to he grown in a pot.

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Hedging Your Garden

Saturday, March 14th, 2009

The arguments as to the season for planting rage perennially in gardening circles but aiven the choice I prefer mid-March. Once planted make sure the shrubs do not dry out and if necessary water twice a day. A thick mulch of peat ensures that the soil retains a comfortable amount of moisture, having first made sure that the rootS were well soaked before they went under ground. Mbst hedges grow at a rate which permits the roots to balance and support the top growth, unless very large specimens are used and this practice is fraught with all sorts of perils.

Of the cotoneaster, a genus which includes so many beautiful shrubs, only one has proved of outstanding value for hedging purposes. Cotoneaster simonsii is really neither evergreen nor deciduous so it was difficult to decide which .section it should come under. Strange that a shrub so fiercely upright in habit should reflect an air of informality. In autumn every twig of its 6-ft. frame is festooned with orange-scarlet berries, a spectacle enhanced by some of the leaves remaining green while others take on the full panoply of autumn’ scarlet.

The shrubs chosen for hedging must be beautiful in their own right, either in leaf, berry, or flower, hardy enough to stand the rigours of soil or climate, and thick enough to give shelter without constant attention. The list of shrubs which approach this standard of excellence is surprisingly long.

The best I have tried so far is Green Hedger, a closely branched erect bush with deep green foliage. After 7 years this variety has reached 6 ft. in height in my own garden without spreading far enough to need clipping. Spacing should be 3 ft. apart, unless money is no object when they could go in at 2 ft. apart making a solid barrier quicker but serving no other useful purpose. Both C. I. fletcheri and C. I. fraseri have quietly attractive grey-green leaves growing to about 12 ft. high in the fullness of time. A mixture of the green forms with the yellow-foliaged stewartii or smith ii makes a picturesque screen on a sheltered site.

Whatever the hedge chosen cultivations before planting are the same. The site must be deeply worked with a plentiful dressing of organic matter and should then be allowed to stand over winter. In late February, as the soil dries out, work in a dressing of a complete fertiliser at 2 oz. per sq. yd., then allow a further fortnight for the soil to settle and begin planting. If the land tends to hang a little wet, raise the centre somewhat above the surrounding area. However, if there is a positive waterlogging a proper drainage system is the only solution.

The spacing of the individual plants will depend on the genus and species being used but if this distance is to be anything up to 18 in. apart take out a trench. Above this distance individual holes are less labour. Sometimes when a thicker hedge is needed quickly a system of double row planting can be adopted with the plants in the second row being planted between those in the first row.

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Taxus

Saturday, March 14th, 2009

The owners of small gardens need to utilise every scrap of space and they, therefore, must be more selective in their choice of plants. Climbers and wall plants will provide the answer to many problems for they will add both space and height to congested sites and will bring colour to every available wall.

Taxus baccata is a native plant surrounded by a wealth of legend. Like many other trees long cultivated in gardens it has given rise to several variants. Adpressa makes a dense shrub which tends to form several leaders but I prefer the golden-leaved aurea for the way its leaves cheer up a dull February day.

No matter what treasured climber is planted, the wall will provide a protection not enjoyed by the denizens of the open garden. Before attempting any planting examine the soil at the foot of an average house wall. Usually it consists of builders’ leavings, sub-soil, pot crocks and other aridities, possibly enriched by a few tea leaves. All this must be excavated and replaced with soil from a fertile part of the garden.

A good mixture consists of 5 parts of garden soil to 2 parts of peat plus a 6-in. pot of bonemeal to every barrowload of the mixture. Only a narrow border need be made, 2 ft. wide by 15 in. deep, for given a good start healthy roots will penetrate less profitable fields.

There are two species of Actinidia especially suitable for wall culture, butoboth need different treatment. Actinidia chinensis will riot over an acre of wall in an undignified scramble. The large leaves, 6 to 8 in. across, and fragrant flowers are recompense enough if space can be provided, but really only a castle offers sufficient wall space and even then, should the drawbridge be left down, it could prove a liability for once inside it would take over the uppermost turret.

A. kolomikta is a shrub of feminine complexity. It is incapable of deciding on a suitable leaf colour, the lower half remaining green while the upper half turns white and pink. I avoid hard pruning for the stems being hollow tend to die back along the whole branch. A thinning of the twigs is a permitted indulgence. A warm south or west-facing wall suits actinidia best.

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Chillies Cultivars Information

Saturday, March 14th, 2009

Cytoplasmic male sterility in Capsicum was discovered by Peterson (1958) and can now be used for producing hybrid seed.

Many of them are red when ripe. They take from 60 to 75 transplanting to the first harvest at the green-mature stage. They are typically thick-fleshed, three- or four-lobed, 10-12.5 cm long and about the same maximum diameter. A well-known and widely grown cultivar is ‘Californian Wonder’ and selections from it such as ‘Florida Giant’ and `Yolo Wonder’, the last named being resistant to tobacco mosaic virus. Two tapering cultivars are ‘Neapolitan’ and ‘Ruby King’.

Capsicums are killed by frost. They are grown in the tropics from sea level to 2 000 m or more. The quick-maturing sweet peppers can be grown in warm-temperate countries, although it may be necessary to raise the seedlings in heated seed beds or glasshouses. They do not thrive well at low temperatures. Boswell et al. (1964) give the optimum temperature of 24 C and say that the crop will fail to thrive at temperatures between 4 C and 15 C. Deanon (1967) states that the maximum set of bell or sweet pepper occurs at temperatures of 16 C to about 23 C, but adds that night temperatures below 16 C and day temperatures above 32 C prevent fruit-set. Low humidity and high temperatures will cause abscission of buds, flowers and small fruits.

Even for the quick-maturing sweet peppers, Boswell et a!. (1964) state that at least 3 months of warm weather are required for good yields and 4 to 5 months for most other cultivars. They say that above 32 C, blossom dropping becomes excessive and that many fruits that set at temperatures above 27 C are likely to be small or poorly shaped because of heat injury.

Pickersgill (1969) considers that as a result of domestication there has been a shift to increased self-pollination with shorter styles at or near the level of the anthers. Self-incompatibility is reported in some wild species, but is unknown in cultivated forms, so that they can be grown in small areas without losing their identity. Increased inbreeding is possible by man selecting for high fruit set and plants that come true from seeds. Popova (1973) states that the percentage of cross-pollination is higher in flowers whose stigmas are higher than the level of the stamens. The vitality of the pollen can be preserved between 8 and 10 clays when it is kept at a temperature of 20-22 C with an atmospheric humidity of 50-55 per cent.

Capsicums are usually grown as a rain-fed crop in areas with 600-1 250 mm of rain. In areas of low rainfall they can be grown with irrigation. They cannot tolerate waterlogging. Too heavy a rainfall can be detrimental as it can lead to poor fruit-set and rotting of the fruits.

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Budding and Grafting Garden Plants

Saturday, March 14th, 2009

For the man who devotes all his time to the garden there is the mist unit bench. This automatically switches on a fine mist spray whenever the air surrounding the cuttings reaches a certain stage of dryness. This high degree of atmospheric humidity prevents the cuttings losing moisture and with thermostatically controlled soil warming providing an ideal rooting temperature the results achieved can be dramatic.

Not all are so obliging and must be helped in a small way. This process is known as layering and the main requirements are patience and a soil in good physical condition. A few weeks prior to layering work in a liberal quantity of peat and sharp sand around the selected plant.

Any branches low enough to be pulled down to soil level will be suitable. At the point where the branch touches the soil make a cut of about 2 in. into the centre of the stem and then gently push a piece of sphagnum moss into the cut to hold it open. Peg the cut surface down firmly to the ground and cover with the sand- peat mixture to a depth of about 3 in. In addition to the peg and the layer of compost I place a large stone on top as this holds everything firm and keeps the compost underneath moist.

I prefer a straight blade and handle for all grafting work. The tying materials used are very much a matter of personal choice, but of the products available, a wide-ribboned soft raffia is my first choice. Grafting tape or ready- made ties are effective alternatives. Cold wax is less trouble to use than the limp wax which needs heating over a fire.

The stocks chosen for grafting arc either lined out in nursery rows especially malus, prun us and pyrus, which can not be potted up, or, as with rhododendrons, peonies, conifers and similar ornamental shrubs, potted up into a cold house for working. For most forms of grafting the ideal situation is to have the stock in growth and the scion still dormant when the union is made.

Of the 9 or 10 methods of grafting commonly practised in commercial horticulture, whip and tongue is the technique used more frequently than any other. To achieve a reasonable degree of success both the scion and rootstock sections to be married must be approximately the same size.

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Garden as a Unit of Composed Plants

Saturday, March 14th, 2009

I try to consider my garden as a unit composed of plants, animals, birds and insects rubs in addition to providing color also supply food for the birds in the form of berries. One of the most graceful of all small pendulous rubs is the evergreen Cotoneaster salicifolius ossus. The narrow leaves are dark shiningon large drooping stems and in autumn it is light with a mass of deep red berries. By Christmas the berries have all gone, and only – shrub’s elegance remains to delight the gardener.

As a contrast I included a Berberis gracilis nana which for two years sat like a vegetable owl, but now has taken a fresh interest producing each April a most creditable crop of yellow flowers. Another berberis, verruculosa, is 30 in. high, a dome of hard green leaves which are silvered beneath.

That Stranvaesia davidiana is so frequently said as an erect branching shrub surprises me. I know three 20-year-old bushes at Harlow Car and all have developed an umbrella habit which I find becoming. Planted round with the evergreen hummocks of Genista hispanica it makes a perfect group to soften the hard angle between border and lawn.

Gradually over the years the picture was filled in first by adding Chamaecyparis lawsoniana wisselii which forms a narrow dark green column and then by planting, just to one side, a maple with its intricate twig pattern.

Conifers play a dominant role in the second group which began with a specimen of Juniperus x media pfitzeriana and then had a Chamaecyparis pisifera plumosa aurea added for contrast with its yellow cone outline showing up well against the tiered grey-green of the juniper.

The composition of this piece of garden took my ingenuity to the utmost but gave me infinite pleasure also. Now, as it matures, I look for t other ways to improve it, for such is the essence of gardening, changeless yet ever changing.

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Tips on Grafting and Budding

Saturday, March 14th, 2009

The rootstocks of roses are lined out the previous autumn. When selecting bud sticks look first at the shoots that have already flowered. The buds near the centre will usually prove ripe for insertion. Keep the sticks fresh after they are cut in moist sphagnum or a jar of water; first removing the leaves but leaving a small piece of stalk as a handle to hold the bud while it is being inserted into the T cut.

Prepare the stock by cutting it down to the required height above soil level, for the beginner I would suggest 4 to 6 in. This should be done so that a sloping cut surface is left approximately 11 in. long. Finally a small downward cut is made half way up the slanting surface to leave a tongue.

A matching cut is made on the scion to ‘take a bud’, or in simple terms a bud is left to of an inch from the tip, but on the opposite side to the cut surface. Then make a tongue to fit neatly over that already inserted in the stock. Fit the two in position, see that the cambium layers are flush, bind them together with strips of moistened raffia, then paint the tie with grafting wax to complete an air and watertight seal.

Splice grafting is the same only without the tongue and I use it on soft-wooded clematis. Saddle grafting is used frequently for rhododendrons. R. ponticum stocks are grown on in pots on a warm bench for twelve months before working. At the appropriate season, as the sap lifts, make two slanting cuts on the scion in an upward direction to leave an inverted V like an old fashioned clothes peg.

Any suckers which appear, as they inevitably seem to, should be removed before they make too much growth. All the available food will be sent up to the terminal buds of the plant so that by October the snag of old wood to which the shoot was tied can be cut away.

The rootstocks for crataegus, sorbus, laburnum, and many other trees can be raised so easily from berries gathered from fields and woodland that budding and grafting offer a cheap, albeit fascinating, method of furnishing the garden.

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Free Gardening Advice, Tips and Information

Saturday, March 14th, 2009

Whatever the conditions, however, no shrub will succeed unless planted in a well-prepared soil. There is no short cut to soil fertility, no chemical magic to change overnight a sterile desert into a Garden of Eden, no matter how hard the manufacturers advertise their individual wares.

Drainage must be a primary concern except when the garden is sited on a sandy soil when the problem will be water retention rather than draining an excess away. Some gardens have a system of tile drainage which will cope adequately with any excess rain, short of a tropical thunderstorm.

The first rains of winter will soon discover any defects in the drainage. If water stands in puddles round the rose beds or on the lawns it may be that the existing drains are blocked or damaged.

Into the bottom fork a generous dressing of whatever organic matter is available. Those living in a town will find a mixture of coarse bonemeal and peat the cleanest to handle. A further dressing mixed with the top spadeful leaves a beautifully worked soil into which the roots can penetrate freely.

During prolonged wet weather a heavy crop of weeds may develop and an excursion with a broad-bladed hoe on the first bright sunny day is the best way to clear this particular nuisance. I choose the blade, then bend it in a vice until, when fitted with a handle, it sits flat in a working position while my`’–back back remains comfortably straight. I gave. up bending to push hoes many years ago.

A rake is a refinement and not really essential. A fork or cultivator will do the necessary levelling off of the soil before planting. A reel and line will be needed to ensure that the various hedges are laid straight and true. Few people have a reliable enough eye to work without one.

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The Joy of Gardening

Saturday, March 14th, 2009

I would consider a garden without evergreens, especially conifers, to be incomplete. Throughout the year they play an important role in providing a subtle contrast in shape and foliage texture and they are very valuable when the cold ngers of frost have stripped the foliage from -deciduous trees.

The foliage of this hybrid is blue-grey above, copper red beneath. and I first saw it against white birch stems patterned with February sunshine. The specimens here are 5 ft. in height by as much across.

The short powerful stem and weeping habit make this a useful small garden tree. Mine is only 3 ft. high but planted high up in the rock garden, so that the sunshine brings out the full beauty of the blue-green foliage, it presents a wholly satisfying illusion of grandeur. Another conifer which was bought after a visit to Windsor Park is Chamaecyparis lawsoniana knowefieldensis. I first saw this on a day of shower and sunshine and my immediate impression was that of a green waterfall cascading down the heather bank.

Now I have a plant of my own tumbling down a slope in the rock garden and the deep green overlapping sprays of foliage look exactly like the ripples of a fast flowing stream. Though slow growing I take pleasure in watching my own plant grow into a most impressive silhouette. Rhododendrons add a certain dignity to the landscape. Rhododendron falconers towering 20 ft. above a highland glen is a sight to the heart.

Unfortunately, it does need shelter or the large leaves are damaged, and also space or everything around it is smothered. There are, however, smaller members of the genus which in flower are superb, but afterwards have a beauty of form or leaf which suit them admirably for inclusion in a chapter of this sort.

I grow R. williamsianum over an old oak stump in an attempt to emulate the superb specimen at Englingham, Northumberland, where it makes a perfect mound of rounded, heart-shaped leaves 30 in. high in bold relief against the white of-a waterfall. In May the pink bell-shaped flowers are followed by the copper bronze of young growths.

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