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Sunburn/Leaf Scorch from Direct Sunlight Exposure - Annuals, Bulbs, Groundcovers, Perennials, and Vines

Leaf scorch due to direct sunlight during the growing season is often caused by a sudden change in exposure caused by tree removal or transplanting from shady areas into sunny areas. Drought conditions can also cause leaf scorching along the margins or leaf tips. Also, some plants grow best in...

Frost and Cold Injury - Annuals, Bulbs, Groundcovers, Perennials, and Vines

When a cold period follows a long period of unseasonably warm temperatures that initiates new growth, temporary leaf damage may occur if temperatures dip below freezing. The damage appears as white, bleached areas on leaves. Most plants outgrow this type of cold injury but if they do not the...

Falls Over - Annuals, Bulbs, Groundcovers, Perennials, and Vines

Some plants require staking because of their habit of growth. A plant that naturally grows taller than wide may need to be staked. Other plants, such as yarrow, baby's breath, balloon flower, asters or bachelor's button, have many shorter stems that are weak or floppy. Plants with long flower...

Excess Water/Edema- Annuals, Bulbs, Groundcovers, Perennials, and Vines

Problems with excess water can result from poorly drained soil, prolonged periods of rain, or overwatering. Excess water reduces oxygen in the soil, which damages fine roots and renders the plant unable to take up water. Plants exposed to excess moisture show the same symptoms as plants under...

Excess Fertilizer/Salt Injury - Annuals, Bulbs, Groundcovers, Perennials, and Vines

Leaf tip browning from excessive fertilizer Salt injury may occur in connection with the application of fertilizers or ice melting products. Damage due to excessive fertilizer or salt application generally appears as marginal leaf browning or leaf scorch. Salts can be toxic to root tissues causing...

Leaf Yellowing/Environmental Stress - Annuals, Bulbs, Groundcovers, Perennials, and Vines

Back to Leaf Yellowing/Browning of Leaves Leaf yellowing is often one of the first symptoms of plant stress. If the stress causing condition is not alleviated, yellow leaves may turn brown. A prolonged period of environmental stress causes overall stunting and poor growth. Noticing the pattern and...

Drought - Annuals, Bulbs, Groundcovers, Perennials, and Vines

Drought Plants wilt when roots are unable to supply sufficient moisture to the stems and leaves. Wilting for short periods of time does not harm plants. Sometimes a plant wilts on a hot day because moisture is evaporating from the leaves faster than the roots can supply it. If there is ample soil...

Leaf Yellowing/Cultural Factors - Annuals, Bulbs, Groundcovers, Perennials, and Vines

Back to Leaf Yellowing/Cultural Factors Impatiens with nutrient deficiency A plant problem that is not caused by a living organism is called "abiotic" injury. Sometimes gardening practices (cultural factors), such as lack of soil preparation, improper planting procedures, planting too late in the...

Air Pollution - Annuals, Bulbs, Groundcovers, Perennials and Vines

Bronzy leaf spots on Rudbeckia foliage Air pollution damage is more common in urban areas but can also occur in suburban and rural areas downwind of industrial sites. The severity of plant damage caused by air pollution varies with the time of day and with environmental conditions such as heat,...

Whiteflies - Houseplants

Adult whiteflies resemble tiny white moths. They are about 1/16th of an inch long, white, with four wings, and may be covered with a powdery white wax. The nymphs or immature whiteflies resemble flat disks on the undersides of the leaves and may or may not be covered with wax. Whiteflies injure...

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