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Weeds will compete for the soil's nutrients and slow the development of young thyme plants. Control the weeds around seedlings either through weeding or mulching. Mulching with limestone gravel or builder's sand can improve drainage around the plants and prevent root rot. You can try other mulches made of organic matter like leaf mold or straw, as well. Thyme is a hardy, drought-resistant herb. You need to water the plants on a regular schedule, but not often. Too much water will cause root rot. Give the plants a good watering when you see the soil around them has gone completely dry. Soak the ground thoroughly and wait until the soil dries completely before watering your plants again. Once your seedlings take off, the plants will need very little attention to thrive. Thyme doesn't need a lot of nutrients to survive and too much fertilizer will cause it to lose its flavor and become gangly. Mulch your plants in autumn with organic matter like leaf mold, well-rotted animal manure or compost. This will deliver the minimal nutrients thyme requires all year long, as well as protect the plants from frost once winter arrives. If you want your plants to continue being bushy and producing tender stems, you will need to prune your thyme back to half its previous height every spring. Do this after the last frost. If you do this, the next spring it will flourish again. After three to four years of growth with the same plants, their stalks will become woody and the plant will produce fewer leaves. At this point you may want to start a new batch of seedlings, especially if you cultivate thyme for culinary purposes. Use an almanac to check when the last frost usually occurs. After this date, it may be safe to cut back the thyme.

Summary:
Control the weeds around your plants. Let the soil get completely dry between waterings. Avoid over-fertilizing thyme. Cut thyme back every spring.