Leaflets may roll slightly. Maximum water use occurs during vine growth and early tuber development. To prevent the maturing tubers from being predisposed to rot organisms, reduce watering when vine death begins. In the home Garden, weeds are most easily controlled by hoeing, pulling and light cultivation before the plants reach 8 to 10 inches tall. Avoid cultivation after this stage, as root damage may occur which will reduce yield.
Weeds compete with potato plants for light, water and nutrients.
After the plants reach 8 to 10 inches tall, they are better able to compete with the weeds. The most common weeds in potatoes are red root pigweed, kochia, lambsquarter and nightshade. If thistle or quackgrass become a problem, consult your Colorado State Cooperative Extension county office or Garden supply store for information regarding the proper herbicide to apply. Treat insect pests with insecticides or, for those preferring organic controls, with insecticidal soaps. Common Insects in Colorado home Gardens include aphids, flea beetles, psyllids and, in some areas, Colorado potato beetles.