Indigofera benthamiana Hance
Indigofera glegoides liukiuensis Matsum.
Indigofera kotoensis Hayata
Indigofera okinawae Ohwi
Indigofera teysmannii Miq.
Indigofera zollingeriana is an erect shrub or small tree; it can grow 1 - 12 metres tall[
]. The bole can be up to 15cm in diameter[
The tree is used as a green manure crop and to provide shade in plantations[
E. Asia - China, Thailand.Cambodia, Laos, Vietnam, Malaysia, Indonesia, Philippines.
Mainly found on coral strands and sandy beaches, at elevations up to 850 metres[
]. Sunny places, trailsides, forests; at elevations from 400 - 600 metres[
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Indigofera species generally grow best in a sunny position, preferring a well-drained but moist soil[
]. Many of the species will also succeed in drier conditions and in poor soils.
This species has a symbiotic relationship with certain soil bacteria; these bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby[
A shade plant for young tea, cocoa and coffee plants[
Used as a green manure and cover crop in coconut, tea, coffee and cocoa plantations in Sri Lanka and New Caledonia[
Seed - it has a hard seedcoat and may benefit from scarification before sowing in order to speed up and improve germination. This can usually be done by pouring a small amount of nearly boiling water on the seeds (being careful not to cook them!) and then soaking them for 12 - 24 hours in warm water. By this time they should have imbibed moisture and swollen - if they have not, then carefully make a nick in the seedcoat (being careful not to damage the embryo) and soak for a further 12 hours before sowing.
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