Rhododendrons in containers depend on regular feeding and watering from you. rhododendrons prefer a moist, well drained, acidic soil with a pH between 4.5 and 5.5. Feed regularly with a slow-acting plant food monthly, or with a soluble fertilizing composite every two weeks, according to … These plants should be pruned in late spring, after they have flowered. Remove dead flowers from rhododendrons carefully; next year’s buds are just under the old … Because rhododendrons root much more shallowly than other plants, it’s extra important to keep a thick layer of mulch over this delicate system. However, very little pruning is required. It’ll also slow water evaporation from the ground, helping your plant stay hydrated. rhododendrons … Spread 2 or 3 inches of mulch under the rhododendrons; use pine bark, wood chips, leaf mold or pine needles. Four inches of an organic mulch, like wood chips or pine needles, is often adequate protection from the cold. Extend the mulch under even the widest branches, called the drip line. After flowering, deadhead where practical, to promote vegetative growth rather than seed production. Removal of spent flower heads is important for promoting next years bloom as well as a good overall shape. Rhododendrons are shallow-rooted plants that require water twice per week during the first growing season. For milder climates maintain a good layer of mulch and make sure not to plant it in openly windy areas or low spots. Water your rhododendrons only after the … Rhododendrons – Pruning, Winter Care and Fertilizing. Once plants are established, though, you should only have to water during dry periods (2 to 3 weeks without rain). Do not mulch directly next to the stem; leave a 2-inch space. According to Bruce Zimmerman in his 2003 article for Hort-Pro, "Rhododendrons the King of the Garden", you should create a burlap screen for the rhododendron in extreme climates. Water plants during the summer if rainfall is less than 1 inch per week. Water them only when the soil has dried out to about 3 inches down from the surface. If your soil drains poorly, mix the existing soil with equal parts of Complete Planting Mix® and organic matter such as peat moss, fine pine mulch, or composted oak leaves. How to Water Rhododendrons. Remove crossing or crowded side branches back to a main branch.

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