It's time--once again--to cover or take in vulnerable plants.

Tomatoes and peppers are most at risk. Other plants easily damaged by low temperatures include other warm-season vegetables and herbs such as squash, melons, basil and beans--as well as ornamental plants such as sweet potato vine, marigolds and coleus.

If you can't bring them inside, cover them with sheets or pots. In some cases, just dig them up. Their roots really haven't taken hold yet. Pop them back in their nursery pots.

All this stress will take its toll on plants. After this particular threat is over, feed them. Plants that have been damaged by cold or hail will often respond to kelp. This liquid extract from seaweed encourages new growth.

It can be used on annuals, vegetables, tropical plants, perennials, shrubs and roses. Liquid kelp is mixed in water to dilute it. This tonic will help stressed plants to repair and rejuvenate.