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White Cassia or Silver Senna
Characteristics: Erect shrub 2 m
Seeds per packets: 10
An erect shrub with silvery-grey leaves 5-10cm long with yellow flowers around 1 cm in diameter during winter and early spring.
A useful shrub for dry gardens that requires little maintenance. Attracts birds and insects.
Occurs naturally in the arid regions of Northern Western Australia, the far northern regions of South Australian, Queensland and New South wales
Adaptable to most soils providing it is well-drained but prefers a medium to heavy soil in a open sunny position, drought and frost tender.
Although seed can be sown most of the year in Australia seed is generally best sown in spring or autumn, avoid the coldest and hottest months of the year. The optimum germination temperature for germination is around 18-22°C.
Seeds germinate readily, however they do have a hard outer coating which is impervious to water and generally germination will normally not occur unless the seed is scarified by abrading or pre-treated with boiling water first.
General note: Seeds of many natives are dormant and require specific conditions or pre-treatment for germination.
Do not be too hasty to discard seed that does not germinate, seeds will often lay dormant until the conditions are similar to their natural requirements for germination to occur. Containers put to one side will often surprise long after they were discarded.