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Water once per week. Pinch back new shoots to control growth. Check for diseases and pests.
Tomatillos require regular watering, but it is not necessary to keep them saturated. Plan to water them well once per week, or twice per week during extra hot or dry weather. To reduce the risk of mold developing, try to avoid getting water on the leaves and stems of the tomatillos. Water at the base of the plant instead. Tomatillos will easily grow out of control if you do not keep a close watch on them. If you are concerned about the tomatillos growing too much, watch for new shoots and pinch them back as they appear. Tomatillos are resistant to diseases and have few threats from insects and other pests, but you should still be on the lookout for these issues so that you can treat the plants if necessary. Some of the diseases and pests that may afflict tomatillos include:  Cutworms. These are worms whose larvae feed on the inside of tomatillos, and on the stems and leaves. Several insecticides can help to control cutworms including Root-knot nematodes. These insects feed on the roots, which causes the plants to wilt. Tobacco budworms. The larvae of these worms eat the inside of tomatillos. Whiteflies. These flies eat the underside of tomatillo leaves. Black spot. This disease causes black spots on the leaves and fruit. Apply a fungicide to the plants. Tobacco mosaic virus. This disease causing wilting, decreased size, and reduced yield. You will need to remove the affected plants to prevent the disease from spreading.