Put these unwelcome guests to work and let them tell you what's wrong with your garden.
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Another problem that will keep plants from looking their best is compacted soil — soil that doesn't leave any room for air. Lots of garden plants need room to spread their roots and benefit from a little air in the soil, so your soil could be smothering them. Some cultivated plants don't have strong enough roots to penetrate through compacted soil, but there are some weeds that don't mind growing in a tight squeeze. Here are two common weeds found in compact soil:
Cultivate and amend heavy clay soil with compost. If your lawn has weeds, aerate it. An aerator tool will pull out small pieces of the lawn, introducing air into the soil.