Can be used right away, just as they are or added to a container garden. During their growing season in spring and summer, give them plenty of sun, keep the soil moist but not wet, in pots and soil with excellent drainage. Bring inside for the winter when the plants are dormant. Water much less frequently and keep the soil a bit on the dry side. In the winter they will take temperatures down to 50°F.
The 3.5” 18 per tray are not combos but are mixed trays of assorted 3.5” succulents.