Gardens on Clay Soils

New Zealand Herald, Volume LXXV, Issue 23020, 23 April 1938, Page 10 (Supplement)

Gardens on Clay Soils

Show of Beautifu "IV/TOST garden enthusiasts would like to grow plants for which they have a certain amount of affection. It is, however, far better to recognise the limitations of a garden and make a feature of those plants which are likely to do well. Those gardeners who have to contend with heavy clay must limit their choice to the strongest and most vigorous of the perennial genera, for only these are likely to succeed under such conditions. Many fine perennial borders are to be seen, made on such soil, but their success is due to a careful selection in the first place, combined with the principle of spring planting. In addition, the continual use of the hoe is necessary to prevent the surface becoming hard in dry weather. Some of the more vigorous kinds of delphiniums should do well and may be relied upon to produce good spikes of bloom. As a help toward this end, a plentiful supply of horse manure can be placed within reach of the roots and a top-dressing of fish manure given. No border can be complete without some of the modern lupins. In clay Boili),

Flowers Possible

however, lime is often present. As lupins have an antipathy to this chemical, the effects should be counteracted by giving a dressing of sulphate of iron before planting, 'iwo ounces to tho square yard should bo an effective amount. The varieties of Scabiosa caucasia, on the other hand, have an appetite for lime and can scarcely get too much. Even when lime is present in the soil, the application of carbonate of lime at tho rate of three ounces per square yard, after planting, and when the roots are just becoming dormaut, will greatly enhance the display of bloom. Asters of all the perennial groups will do well on clay soil, and in addition to those that are old favourites, there are some new varieties well worth trying Some of the kniphofias or torch lilies should certainly be included, the flaming blooms lighting up the borders wonderfully in summer and autumn, It should be remembered, however, that kniphofias are best planted in spring, just as growth is commencing. The hardy garden pinks are always delightful for the front of the border and of these there is now a good selection to choose from. Even when not in flower the silvery foliage is quite ornamental.