Environmental Factors & Ivy Plants

Environmental Factors for Optimal Growth

• Ivy plants survive best in USDA hardiness zones 4 through 8, which encompasses areas that experience temperatures as low as minus-20 F to minus-10 F for zone 4, and 10 F to 20 F for zone 8. They should be planted in moist but well-drained soil that is high in organic material. Ivies prefer a partially shaded environment and can survive in deep shade, though it will not grow as prolifically.

Negative Environmental Factors

• Ivy plants do not tolerate environmental extremes. Too much moisture can lead to rot and fungal diseases. Heavy soils such as those with a high clay content should be avoided. Extended periods of drought will kill ivies, and the plant will also succumb to heat stress when exposed to too much sun. Conversely, too much cold will kill ivy plants. When it comes to space, Ivies need plenty of room to grow. If the site selected for ivy is restricting, the ivies will become root bound and ultimately die.

Pests of Ivy Plants

• Ivy is bothered by very few serious pests. They can, however, attract some sucking pests like aphids and spider mites. Hot and dry weather favors these pests. Symptoms of spider mite damage include a yellowed, mottled or stippled appearance to the leaves along with a fine webbing. Aphid damage is evinced by a curled or puckering of the leaves caused by the aphids drawing out the nutrients of the leaves. Natural controls include introducing lady bugs to eat the aphids and frequently hosing off the leaves to dislodge the mites. Systemic insecticides can work for aphid control and a pesticide labeled for use on mites can keep them under control.

Care of Ivies

• Aside from environmental conditions, there are some maintenance practices that should be performed to keep your ivy healthy and thriving. Ivies benefit from applications of complete fertilizers that contain nitrogen, phosphorus and potassium in a ratio of 3:1:2 or 3:1:3. Annually, ivy should receive 1 lb. of actual nitrogen per 1200 square feet of plant area. Ivies should also be trimmed periodically to keep them from getting too spindly. This may need to be done several times each year if the ivy is planted in ideal conditions.