Yucca baccata var. baccata, the so called banana Yucca or blue Yucca presents a massive and solid stature with beautiful symmetry. The leaves are broad, long, stiff, and sharp and the flowers are large and creamy color.
The seeds are sown in mineral-based cat litter or perlite 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