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Dick Maas was the person responsible for making Potentilla 'Arc-en-Ciel' available to the world.

An unusual Rudbeckia form

 
Persicaria amplexicaulis 'Taurus' has a more compact habit than 'Firetail', with fatter spikes of richly coloured flowers. In Dick's garden it blooms from June right through till frost.

 
The flowers of this Sedum with remain green when they are open.

Persicaria 'Inverleith' grows to just 18" with an amazingly compact, tidy habit.

Dick is enamoured with this Poppy, given to him by British plants guru, Bob Brown