The bloom period can be extended by making successive plantings and maintaining a mix of flower species. In all instances, this farmscaping technique resulted in significant reductions in pesticide applications. Tansy is readily attacked by the tansy aphid-a pest that does not generally feed on other economic crops. The aphids become food for populations of predators and parasites, especially lacewings and ladybird beetles. At a later time, these beneficials migrate to nearby crop plants to control other aphid species which may attack them.
Annual systems are less stable, since everything above ground starts from scratch each year.
These organizations do not recommend or endorse products, companies, or individuals.