Stinging nettle Stinging nettle is a perennial plant. Skin contact with stinging nettle commonly causes welts. Description and Life Cycle: Grows from 2 to 6 feet tall. Spreads by underground stems or rhizomes to form dense colonies. Stems are erect, four-angled, and bristled. Leaves to 6 inches long; usually long stinging hairs and bristles. Hairs
Knotweed Knotweed grows from long-lived rhizomes but plants live as annuals growing in lawns, vegetable gardens, and ornamental garden especially where the soil is compacted. Description and Life Cycle: Germinates late winter to mid-spring, Stems are 4 inches to 24 inches long; stems are swollen at the joints. Wiry stems form a mat on soil
Nematodes are as small as 1/50 of an inch long Nematodes are microscopic soil-dwelling worms, many less than 1/16-inch long. There are beneficial nematodes and pest nematodes. Beneficial nematodes help turn organic matter into plant nutrients. They also prey on soil-dwelling plant pests such as white grubs and root maggots. Pest nematodes feed on plant
Caterpillar damage to cabbage Insecticides are substances used to control insect pests. There are insecticides derived from plants, animals, and natural mineral sources, and there are pesticides derived from synthetically produced chemicals. Naturally derived pesticides are often accepted for use on or around organically grown vegetables and fruits. Synthetically produced insecticides are not used in
Stephen Albert is a horticulturist, master gardener, and certified nurseryman who has taught at the University of California for more than 25 years. He holds graduate degrees from the University of California and the University of Iowa. His books include Vegetable Garden Grower’s Guide, Vegetable Garden Almanac & Planner, Tomato Grower’s Answer Book, and Kitchen
Stephen Albert is a horticulturist, master gardener, and certified nurseryman who has taught at the University of California for more than 25 years. He holds graduate degrees from the University of California and the University of Iowa. His books include Vegetable Garden Grower’s Guide, Vegetable Garden Almanac & Planner, Tomato Grower’s Answer Book, and Kitchen
Cook Brussels sprouts until the insides are just tender, not soft, and the flavor will be sweet, mild, and delicious. Choose Brussels sprouts that are dark green, tightly formed, and of uniform size–smaller, not bigger is best. Cook the same day they come off the stem or use the sniff test to tell you they
Honey bee Honey bees are important pollinators of vegetables, fruits, flowers and other plants. The honeybee is a beneficial insect. Attract honey bees to your garden by planting flowers high in nectar and pollen including asters, cosmos, calendula, snapdragons, zinnias, foxglove, sunflowers, mints, lavenders, borage, rosemary, Echinacea, and sages. Also provide a water source in
Ladybug Ladybugs are beneficial insects. One ladybug can eat 5,000 pest aphids in its lifetime. Adult and young ladybugs also eat asparagus beetle larvae, Colorado potato beetle larvae, lace bugs, mealybugs, Mexican bean beetle larvae, scale, spider mites, whiteflies, and the eggs of several insects. The ladybug is also called the lady beetle and the
Green Lacewing adult Green lacewings are beneficial insects. Adult lacewings feed on nectar, pollen, and aphid honeydew. Young, larvae lacewings feed on the eggs and immature stages of many soft bodied insect pests including aphids, asparagus beetle larvae, caterpillar eggs and young caterpillars, Colorado potato beetle larvae, spider mites, thrips, whiteflies, leafhoppers, and the eggs
