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Elements of Structural and Systematic Botany
B and T World Seeds' Botanical Glossary

B and T World Seeds' reference number: 11724

The average, annual, minimum temperature zone where Thelocactus leucacanthus San Francisco Hgo. is cold hardy
USDA Zone:9 20° to 30°F   (-6.5° to -1°C)
Type of plant - perennial
Foliage: offsets quickly
Thelocactus leucacanthus San Francisco Hgo. sales history


Thelocactus leucacanthus San Francisco Hgo. is included in the following
B and T World Seeds flowering plant categories.

5:   Cactus Seed List
See also *Succulent Plant Seed List
43:   Herbaceous Border Plant Seed List
62:   Mexican Native and Introduced Plants
281:  Cactaceae
720:   Fire Resistant Plants
Different classes of resistance: some grow back, some don't burn, a few have highly inflammable leaves that leave the rest of the plant intact, some trees don't have lower branches.


Happier and Healthier Plants, Naturally

plant-fungus communities, for improved nutrition, and disease and drought resistance.


Germination guide for Thelocactus leucacanthus San Francisco Hgo.

These notes are a general guide, it is recommended to check specialist literature for some of the more unusual seeds in our lists.
Seed Germination Theory and Practice by Professor Norman C. Deno
Some knowledge about growing from seed is necessary to germinate even the easiest seeds. Most seeds require humidity to germinate, even desert plants like Welwitschia mirabilis require that their growing medium remains moist until germination.

Most seeds require oxygen to germinate, if buried too deep in their growing medium, or if the medium is too wet, the seeds may not get the oxygen they require.
Some seeds need to be in the light (surface sown) or in the dark (sown deep enough to receive little or no light) to germinate. A rule of thumb is to cover the seeds their own width deep in the growing medium, but some seeds prefer to be sown much deeper, and some fairly large seeds like to be surface sown (or higher).
Many seeds germinate best at certain temperatures, some will germinate at a comparatively wide range of temperatures, yet others need fluctuating temperatures.
Almost all seeds are waiting in a dormant state for some outside stimulus to break their dormancy, some just need sufficiently high ambiant humidity, others need scarification, vernalization or to be passed through the intestines of an animal.

Thelocactus leucacanthus San Francisco Hgo. 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 Thelocactus leucacanthus San Francisco Hgo. 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 Thelocactus leucacanthus San Francisco Hgo. 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.

Cacti


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