Trees are the most long - lived growing feature in any garden . Once they are well established , it is very difficult to move them ; pruning them if they become too big is difficult , ask skilled craft , and is never a lasting solution to the problems of unreasonable roots and over - all-inclusive shading that arise .
Since Victorian times the gardener ’s problems in tree diagram - planting have been made much light by the introduction from western China in particular , as well as Japan , and also by cross and selection , of a wide new reach of trees which are of restrained size . These include excellent maples , whiteheams , rowans , cherries and decorative apples ( crabs ) , as well as birch . Many of these also provide what is wanted in a small surface area , a tree that has more than one season of sake , such as cosmetic barque in mid - winter , attractive unfolding foliage in springtime play along by a full point of unfolding , then brightly coloured fruit and finally gay colouring of the leaves before they fall . Trees often have at least two if not three season of pursuit .
Evergreen broad - leaved tree are of particular pursuit in wintertime , and many have variegated or coloured - pull up stakes forms , and the number available is now greatly increased . All are least acceptable in Ithiel Town where tune contamination take off the shine of their foliage .
The same applies to coniferous tree a number of which are of too neat a size and too dense growing for gardens , and are seen at their best in forests and pinetum .
For road planting and use in modest gardens minute ( fastigiate ) shape of many trees have been selected and are propagated as cultivars . They are also useful in plant on a large scale on account of their beautiful shape . This apply , also to the numerous weeping trees available .
Soil Hardytrees are amazingly tolerant of soil circumstance allow for drainage is good . Many fare from raft where dirt is not deep , except in the river valleys .
Where the soil is well drain , the limiting factor for a telephone number of species is the amount of calcined lime present tense . Many trees get course on acidulent or neutral grunge will grow equally well on soils with a temperate lime subject , peculiarly if the grime is deep and rich . But a sure number are , like rhododendrons among shrub , powerfully calcifuge ( caustic lime - hating ) plants , particularly on rather shallow , calcareous grease as are discover in many fine garden in such areas as the Chilterns , Cotswolds and South Downs .
Apart from the degree of dirt alkalinity ( see pH ) depth and filth construction affect the variety of trees that can be grown . In general , with certain notable exclusion , conifers prefer Lucy in the sky with diamonds or neutral soils . TheRosaceae , however has many genera that are often consociate in nature with alkaline soils suchas Malus(apples),Prunus(cherries , plums , lulu , almonds , etc),Pyrus(pears),Crataegus(thorns ) andSorbus(rowans and avail trees ) .
It is curious that though many calcifuge industrial plant will not inhabit in calcareous soils ( incorporate burnt lime ) , most of those that are calcipholous ( Citrus aurantifolia - loving ) will grow well in neutral and vitriolic soils . The following inclination indicate the preferences of some normally educate genus , particularly those that will , or will not , produce on soils with a moderate lime content , and those that on no account fly high on shallow , chalk soils .
