means a plant is Hardy anywhere in Britain below approximately 1,000ft (300m).

means a plant is Hardy in the Home Counties if sensibly sited.

means a plant is Hardy in Atlantic Seaboard gardens, The Channel Islands, gardens in Central London (and other large cities) and conservatories.

by a plant name means it's also available as a large specimen - some imported from Italy but most have been grown by us. We've chosen about 15 of the best species and are growing hundreds of them on, at a Secret Location - a whole range of previously unobtainable, small trees, in decent sizes and of landscape quality (ie, easy to grow in a wide range of positions).

by a plant means it's a new introduction. In some cases it means we've actually got some, rather than just listing it.