IN THE GARDEN: Rhododendrons with sad yellow leaves should look much better come spring. November 10, 2023 at 7:00 p.m. by Janet B. Carson ...

Question & Answer Protecting Rhododendrons from Winter Winds Q. I planted a new rhododendron a couple of months ago, and the leaves are already turning yellow and curling up this winter. The plant is ...

Q: My rhododendron has slowly been turning yellow since planting it 3.5 years ago. It gets full sun. My yard has a lot of clay in it, but I planted a lot of good soil around its roots at its planting.

Q: This year the leaves on my mature rhododendrons are turning yellow and falling off. I have no idea what could be causing this or how to prevent it. —Barbara Sterner, Wescosville A: There are ...

Yellow mottling along the leaf margins may indicate an excess of potassium. ... Rhododendrons and azaleas prefer slightly acid soils. Fertilizer is best applied soon after flowering in the spring.

Ones to watch out for are the yellow rhododendrons, which tend to need at least Zone 6 or higher. I tend to pick plants that are hardy to at least minus 15 degrees.

With more than 1,000 varieties, rhododendrons can be found in most places in the country. Here are some tips from the American Rhododendron Society for keeping plants healthy.

All of the true rhododendrons display yellow or green spots on their uppermost petal. These function as nectar guides for the bumblebees, sphinx moths, and other insects that pollinate the plants.