Guest Author - Connie Krochmal
Most stonecrops are easy to grow from seed. Most of the hardy stonecrops are recommended for zones three through nine. There are also tender ones as well that are grown as houseplants.
Seeds of various stonecrop species and varieties are available. In addition, a mix of sedum seeds is also sold, such as that from Stokes. Stokes also has a rock garden blend of dwarf varieties.
Thompson and Morgan has seeds of Turkish Delight Sedum ussuriense. This is a dwarf selection with very dark purplish-red coloring. It is hardy in zones three through nine.
Thompson and Morgan also has a stonecrop rock garden seed mix. Recommended for zones four through nine, these plants are two to six inches in height.
J.L. Hudson sells seeds of various species, including the tender Sedum aizoon and dragon’s blood. Stokes also offers seed of various species.
Seeds of at least 13 species or varieties are available. There is also a stonecrop seed mix of hardy perennials for zones four through eight.
Average germination rates for stonecrop seeds is about 80%. The seed is viable for three to five years.
The seeds can germinate in two to about six weeks. However, some can take longer than others. This can vary from one species to another. If you’re dealing with a mix or don’t know the specific species in the seed mix, here are some general instructions.
For the most part, these are easy to grow from seed. The hardy ones do better if they’re started outdoors rather than in a greenhouse.
The best germination occurs if you can give it a warm temperature during the day (80 to 85 degrees Fahrenheit) and down to 70 degrees at night. Don’t cover these seeds. They’re often planted during the spring.
Sometimes, it helps to chill the seeds before sowing. This would be beneficial to the more hardy types.
The germination time for various types can vary. For Sedum hybridum Czar’s Gold and Sedum kamtschaticum it is about three weeks. For Sedum telephium, it is about one to two weeks. Dragons blood and Voodoo stonecrops can take anywhere from one to five weeks. Sedum reflexum seeds typically germinate in about two to six weeks.