16 key trees and shrubs

1 Wisteria floribunda f. multijuga An elegant wisteria with flower clusters up to 1m long. Train up a post or pergola so the long flowers have space to hang down; if trained against a wall they can become entangled. Robert grows it through sea buckthorn (Hippophae rhamnoides). 8m. RHS H6, USDA 4a-9b^† .

2 Orientalia (=