bush England english flowering plant flowers fuchsia garden Great Britain nature perennial pink purple shrub tender border box divide formal grass green hedge leaves park path plant square stones trimmed abundance abundant allium flower grow head many mauve natural onion profusion stems cranebill gardens geranium pale pink pink petals pink textures plants rose rose pink shrubs summer. lilac spikes spring syringa cultivar Eryngium gray grey prickle Prickly sea holly silver spine spiny