Agapanthus Double Diamond This is a miniature variety of Agapantus with double, pure white blooms. Its flowering spikes are about 20–30cm long. Its prolific blooms and compact size make it ideal for containers. Holds the RHS award for garden merit. Site: ShelteredSoil: Any well-drained soilPosition: Full sunSeason of interest: SummerHardiness: Fairly hardyHeight: (30cm); Spread: (30cm)