The vermiculite has little or no significant nutrients to support the growth of a newly rooted plant. You could leave it but If you transplant it into a nice plyable soilless mix and fertilize, you will have a much healthier plant that has a better chance of avoiding pest and disease problems. Janet

Lavender will not root in 10 days so I guess you are saying you determined you have roots 10 days ago. If you plan on planting in the garden in two weeks time I would leave them in the vermiculte and fertilize with half strength liquid fertilizer. Al

Janet,
when you say, "soiless" mixture, is that the same as the container mixture I normally plant in, or is this something special for newly-rooted plants.

Can you suggest a brand, or what I'm looking for?

thanks,
ellen

Hi Ellen, I use Promix, but the brand doesn't matter, you can use the potting and seeding mix, its lighter than normal pottin soil, it actually has not soil properties it's a mix of peat moss, vermiculite and perlile. Light soil is important for the roots to work their way through as they grow. The vermiculite is a good medium for growing roots, but again has no nutrient value, and if left too long can rot. I always (as taught in my 2 gruelling years of horticulture studies)start to fertilize upon transplant at 1/4 strength every watering unless the plants become turgid (limp), then use straight water and resume the fert schedule as normal next watering. Same for seedlings once they get a couple of sets of true leaves. I did lavender cuttings myself and was told I couldn't do it or it will take forever, congratulations on rooting your lavender, don't ya just love the smell! Janet

I meant to unless the plants are not turgid, turgid means not limp, sorry if that caused any confusion. Janet