posted 11 years ago
The sea buckthorn and siberian pea seeds need to be cold stratisfied, submitted to some moist and chilly/freezing weather.
The honey locust germinates only after scarification, for example, a small knife cut on the seed hard coating, to allow water to enter the seed.
I have grown all of the 3 from seed. If you grow them indoors first, be careful that the sea buckthorn (and the honey locust) are sensitive to be killed by spider mites. Also use a sandy soil for these 3 nitrogen fixing plants, to avoid root rot.
Don't forget elaeagnus, another good nitrogen fixing species. Also a lot more for those with less frost: leucanea, carob, casuarina, tagasaste, pigeon pea...
Our projects:
in Portugal, sheltered terraces facing eastwards, high water table, uphill original forest of pines, oaks and chestnuts. 2000m2
in Iceland: converted flat lawn, compacted poor soil, cold, windy, humid climate, cold, short summer. 50m2