Approximately 0 seeds per gram
seed-counts are only a guide, not to be used for accurate calculations.
B and T World Seeds' reference number:
USDA average, annual, minimum temperature Zone:9
Type of plant - perennial
Flower: WHITE (PINK stripe out)
Fruit: GREEN, seed ~ 1.5x1.25mm. matt BLACK
Foliage: dark GREY stem, stout spines
Common names for Gymnocalycium gibbosum:
is included in the following B and T World Seeds flowering plant categories:
5: Cactus Seed List
43: Herbaceous Border Plant Seed List
64: Argentinian Native and Introduced Plants
Gymnocalycium gibbosum seeds will usually germinate in 5-180 days, even under good conditions germination may be erratic. Normally will only germinate with light so surface sow. Sow Gymnocalycium gibbosum seeds on the surface of a Peaty seed sowing mix at about 25°C.
Sand, and loam, with some sphagnum moss or coir (coconut fiber/dust) make a good mix for germinating cacti and similar seeds. The mix needs to be free-draining, and to be slightly water retentive. Surface sow the seeds and just cover with sand. Start germinating the seeds in shady (dark), humid conditions. As the seeds start to germinate, increase the light and decrease the humidity.