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weeds, such as wild mustard, before they set seed is the best way to keep them from taking over the landscape.
By far, woody perennials are the most annoying weeds. Some species, such as poison ivy, send up vigorous new shoots as far as 20 feet from the parent plant. The smaller, herbaceous varieties are no less annoying. For example, if you hack off a dandelion top without removing the whole root, that one plant will turn into three or four. As a rule, perennial plants survive at least three years, although most live much longer. Like annuals, perennial weeds produce seeds, but they also reproduce vegetatively, from nodes on underground stems and/or roots.
Biennial weeds live for two seasons, growing only roots, stems and leaves the first year and producing upright stems that bear flowers and seeds the second year. Common predators include mullein and Queen-Anne’s lace.
The Best Defenses
No garden will ever be completely weed-free. Nevertheless, attacking weed problems early in the season — before they set seed — is the best defense. If it’s too late to do this, try mulching around your plants to smother out
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