What is a good mulch for rhododendrons?

The best mulch for a rhododendron is one using pine needles. Pine needles have a natural acidity in them and so can help to keep the soil’s pH level to about a 5.5; if you aren’t sure about the current pH level, you can get a soil test kit from your local gardening center.Click to see full answer. Consequently, what mulch is best for rhododendrons?It is best to mulch with a 2-inch layer of an airy organic material such as wood chips, ground bark, pine needles, pine bark or rotted oak leaves. A year-round mulch will also provide natural nutrients and will help keep the soil cool and moist.Furthermore, do rhododendrons like lime? Rhododendrons require regular feeding, but their demand for food is specific. They do not like lime and if you have limechip on your driveways or pathways, lime can leach into the garden and cause them to turn up their toes. Herein, are coffee grounds good for rhododendrons? Lower Soil pH It’s always a good idea to add coffee grounds to compost, but mixing it directly into the soil can help balance alkaline soil or give a boost of acidity for plants that prefer a lower pH, like hydrangeas or rhododendrons.What will kill rhododendron?Remove all stems and branches off the rhododendron with garden loppers, leaving only the main stem. Cut the stem close to ground level, leaving about 2 to 3 inches of stump protruding above the soil. Pour glyphosate, triclopyr or 2,4-D herbicide in a chemical-resistant, disposable container.