5. Don’t buy rampant reseeders
When selecting plants, be cautious of rapid self-sowers. If a plant is known as a “fertile myrtle,” leave it on the garden-center shelf. Plant tags, unfortunately, don’t usually state if a plant is overly generous with its seeds; we usually find this out through trial and error or from exasperated fellow gardeners. So do your homework. Some reseeders to beware of include mallows (
Malva spp. and cvs., Zones 3–8), bachelor’s buttons (
Centaurea montana and cvs., Zones 3–9, photo, right), black-eyed Susans (
Rudbeckia spp. and cvs., Zones 3–11), and most biennials. If you simply must have the plant, stay on top of deadheading; otherwise, the free-spirited progeny will germinate wherever the breeze may carry them.
Photo/Illustration: Steve Aitken