We sell some plants which are considered to be tender or which we treat as tender whilst in a pot and not growing in the ground where they will, once established, survive our cold wet winters. Generally we don't offer these plants for sale until after the last of the spring frosts. We have noted in the individual descriptions when these plants should be available, this is of course dependent upon the prevailing weather.

Agapanthus - these vary in hardiness depending upon variety
Ageratum petiolatum - This is a tender perennial.
Dahlia - these must be treated as tender in some areas of the country and overwintered in a dry shed or similar.
Eucomis comosa 'Sparkling Burgundy' - This is a tender perennial.
Scabiosa africana - This is a tender perennial.

The following Genera once established should survive all but the worst of our British winters but may need to be mulched or planted in a sheltered spot.

Alstroemeria
Gaura
Penstemon
Salvia (some varieties are slightly tender until established)
Verbena