How to Care for Blue Yucca

Prepare a growing medium of equal parts sand, peat, coco fiber and perlite. This mixture provides a light soil with good drainage that the blue yucca prefers.

Fill a seed tray with the growing medium during the summer once the outside temperature remains above 75 degrees F. Sow the blue yucca seeds on top of the surface and cover them with a layer of soil equal in thickness to the seeds' thickness. Keep the tray uncovered.

Place the seed tray outside in bright light but sheltered from direct sunlight. Water the blue yucca seeds with 1 inch of water per week to keep the soil slightly moist but not wet. The seeds should sprout within a few weeks.

Select a permanent planting site when the seedlings are at least 6 inches in height. The permanent site should be in full sun and in U.S. Department of Agriculture hardiness zones 7 through 10. This means the blue yucca thrives in areas where the lowest temperature during the winter is between 5 and 35 degrees Fahrenheit.

Dig a hole in the planting site large enough to hold the blue yucca seedling's root ball. Place the seedling in the hole and fill it with soil. Firm the soil around the seedling and water it with 1 inch of water. Provide the blue yucca seedlings with 1 inch of water per week during the first growing season. These plants should be self-sufficient after that.