Other subjects in need of protection are listed below, but except in very cold districts those marked x would only need it in the first year after planting, as resistance to frost in these cases increases with age and establishment. In all cases winter covering should be removed as soon as new growth begins in spring. Such timing will vary from late February or early March in southern and western districts to early April in more northerly and hilly areas.
To see ‘Arum Lilies’ growing naturally in the garden may come as a surprise. No one can deny their effectiveness and given a moist soil and a sunny situation they will flower from July till well into autumn. Provided they are given a protective covering during November they will come through again in spring and increase in size year after year. Although this Arum Lily is the least hardy of any subject mentioned, the ‘Crowborough Variety’’ is by far the most reliable for outdoor cultivation. Along with other subjects in need of winter protection it is fully worthy of inclusion for the sake of its outstanding qualities because protection is such a simple matter. From experience 1 have found that these tender subjects, which are fully herbaceous and not shrubby are more likely to come through wintry conditions left in situ than if dug up and placed under cover in autumn.
They rely on below ground vitality to survive, as do all plants anddisturbance in autumn can be fatal. Winter covering can be of , straw, or even peat or soil provided a piece of thick polythene sheeting or sack can be placed over or wrapped round first. Zantedeschia and some others do not die down until frost comes, and it is after this elimination of any foliage that final adjustments should be made to whatever is used as covering. The basic need is to keep and crowns from freezing, and this means that the soil between and around plants must be adequately covered. A 6-9 inches depth of leaves or straw will ensure that no frost penetrates through to the soil even in the coldest districts.
ZANTEDESCHIA aethiopica ‘Crowborough’ x Agapanthus x. x japonica.
Cautleya robusta. Centaurea pulchra major. x Crinum. x Cynara.
, erecta. x Kniphofia – other kinds. x Lavatera olbia.
Montbretia. x Nerine. x Penstemon hartwegii varieties. x Perowskia. x Roscoea. x Ruta.
Saxifraga fortunei and varieties. Schizostylis.
Tovara virginiana variegata. x Tricyrtis. x.