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COLUTEA arborescens

Bladder Senna

Stock: Available

SKU Code: F 652


$4.40

Family: Fabaceae
Characteristics: Deciduous rounded shrub 3m

Seed per packet: Approx. 25
Seed per gram: Approx. 55

A rounded quick growing shrub to 3 metres with pinnate leaves and attractive 3cm pea-like yellow flowers during late spring and early summer.
Flowers are followed by bronze-coloured translucent pods that look like inflated bladders (hence the common name). The pods contain the seed and dry to a papery texture and persist on the plant until autumn.

Adaptable to most soils and conditions but prefers a well-drained soil in a sunny position. Tolerates poor soils.
Originates from Europe and North Africa but is popular worldwide where it is grown as an specimen plant and for erosion control.

Grow notes:

Although seed can be sown most of the year in many parts of 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.

The seed of this species 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.

  1. Place the seed in a container and pour in just boiled water and allow to soak overnight.
  2. The swollen seed can then be sown, re-treat seeds that have not swollen.
  3. Sow the depth of seed keep warm & moist but not wet.
  4. Germination should occur in 10-21 days @ 18-22C.

*Seed may also benefit from Cold stratification in hotter regions although it is not critical. This can be replicated by cold stratification in the refrigerator for 2-4 weeks. Alternatively over wintering in the garden in cold climates will assist germination. 

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.

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