Q&A for How to Grow Rhododendron

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What is likely to grow roots faster: a young rhododendron stem or an old, thick, sturdy one? And how long before they grow roots?

Lauren Kurtz
Professional Gardener
Lauren Kurtz is a Naturalist and Horticultural Specialist. Lauren has worked for Aurora, Colorado managing the Water-Wise Garden at Aurora Municipal Center for the Water Conservation Department. She earned a BA in Environmental and Sustainability Studies from Western Michigan University in 2014.

Lauren Kurtz

Professional Gardener

Expert Answer

A young stem will root faster. An old thick stem is unlikely to produce roots. Propagating a rhododendron from a cutting requires careful conditions and patience. It can take 3 to 4 months for a cutting to grow roots. Take a cutting from new growth in the early fall or spring.

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After I planted my rhododendron, I realized my soil is clay. What I need to do to correct the situation?

Ninox

Top Answerer

The best is to dig all around the plant and remove it from the ground. Then you can add sand in the hole and mix it with the clay.

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When do I cut the dead heads of rhododendrons?

Ninox

Top Answerer

Cut dead wood in the late summer. That way, the plant will produce more flowers the following year.

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Do rhododendrons do well with clay soil mixed in with regular soil?

Andy Winder

Community Answer

No, rhododendrons do not grow well in clay soil. It is too sticky and hard to work with, even when mixed with other soils. Because it is not well-draining, it can also cause rhododendrons to drown. Try an alkaline soil instead or add pine needles to a well-draining soil.

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I live near the coast in Northeast Scotland. Can I plant my rhododendron in an east and south spot in my garden?

Ninox

Top Answerer

Yes, no problem. Rhododendron can sustain temperatures to 1°F (-17°C).

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