? Agave macroacantha Black Spined Agave seeds Agave macroacantha a medium-sized Agave native to Mexico, growing as a rosette. The leaves are blueish-gray and up to 55 cm long, ending in sharp black spines. The seeds are sown in mineral-based cat litter (no clumping litter) or perlite (germ-free) in plastic-pots. Please sow the seeds on the mineral soil. Bigger seeds need to be covered with the mineral soil, small seeds should remain on the surface. Then put the plastic pot in a zip lock bag - with a pot size of 6 cm , a zip lock bag of size 12 x 17 cm is recommended . Fill in the zip lock bag as much tap water with a few drops of universal fertilizer, so that after the absorption of the substrate a few mm of water remain on the bottom. Location: on the windowsill or in a small greenhouse in partial shade, daytime temperatures at about 73-83 F, somewhat lower at night at 68-72 F. price is for 5 seeds