A bit difficult to answer without knowing where you are, what sort of garden/soil you have, which plants you bought, the general climate of your area, etc. On their website they say that they'll answer any questions you have so that might also be a good place to start.

If they're just rootless cutting, I'd suggest a bit of root hormone powder and starting them off in a pot(s) of quality potting mix. Mind you, a photo of the cuttings would also help.