I grow quite a few cacti from seed. Here's how you can too.
Prepare your soil. I usually use a 2 inch terra cotta pot (pictured below). I fill with regular potting soil, perilite and basalt sand. I then moisten and microwave to kill any grass seeds. I then sow the seeds on the surface without pressing them down.
If posible, you should keep the pots in a place where the temperature can be kept around 25°C, or 33°C daytime maximum and 15°C night-time minimum.
Prepare your soil. I usually use a 2 inch terra cotta pot (pictured below). I fill with regular potting soil, perilite and basalt sand. I then moisten and microwave to kill any grass seeds. I then sow the seeds on the surface without pressing them down.
Next I put 2 of these pots in a baggie and set them in the shade outside. This pot was basically neglected for 2 months or so after sowing and Voila!
Cacti from seed can be an economical way of growing your collection, and Trichocereus, or Echinopsis are a fairly easy way to get started.
Good basic info! Only thing I might add is, remove your plastic cover slowly, bit by bit, 1/8 at a time, to slowly acclimate to atmosphere. I have lost 80% of my seedlings by removing all at once.
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