Yellow Leaves On English Boxwood

Filed Under: Shrubs, Landscape Gardens, Gardenality Help · Keywords: Hi, Plant, About, May, There, Water, July, Fertilizer, Fungus · 715 Views
Hi, hope you can help me. I planted 18 English box about three years ago. Every spring some
have shown some yellowing leaves which turn green by the end of May. This year about half
still have yellow leaves . These leaves are firmly attached to the stems, none have dropped off.
Last month, mid July, I watered with a kelp based fertilizer. This hasn't had any effect. Can you
suggest what might be going on? And what I can do about it? Many thanks. Diana


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Answer #1 · Maple Tree's Answer · Hi Diana-If the leaves are losing their green coloring then changing to a normal green coloring as the temperatures rise towards summer I'm assuming cold winter weather may be the cause. Boxwoods can be tempermental to any extreme weather changes turning the leaves yellow but normally changing to more green as the temperature become warmer. Many locations the last few years have had unusually cold winter temperatures. Too cold a temperature can not only turn leaves yellow but brown, and somtimes kill the boxwood foliage if cold enough. I have found that too little water will also turn my boxwood leaves yellow. I live in an area that receives very little water during the winter when I also water my plants very little. As the warmer temperatures come I find the leaves will green up nicely as they receive more water. The fact that the leaves are turning yellow but not browning and dropping would make me believe the plants are healthy with no insect infestation or disease. Too much water can cause fungal disease and possibly root rot which will first be indicated with the yellowing of leaves. Insects can also damage and cause the yellowing of leaves. If you have no spotting on the leaves, holes or other of the leaves, or a decline in the plants growth I believe the problem is weather and or proper soil moisture. If the soil drains well and the plants are kept moist but not too wet or dry I believe winter or spring cold temperatures are the problem. Nutrient definciencies can also cause yellowing but with no changes in coloring after fertilization I don't believe this is the problem. If the plants are growing well other than showing this yellow coloring the first part of the year they should be fine. Hopefully if you live in a location where you have received unusually cold temperature the next few years will be more normal helping to keep the plants green coloring year round. What location or hardiness zone do you live in? If you give me you state and city I can look up your hardiness zone. This may help to determine if the weather was a factor in the foliage turning yellow.

Please ask if you have any other questions.

John)


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Diana Walsh

Diana Walsh · Gardenality Sprout · Zone 8A · 10° to 15° F
We live in Rockbridge County, VA, zone 6b. We had a terrible winter here. You're probably right. Thank you very much. Diana

4 years ago ·
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Maple Tree

Maple Tree · Gardenality Genius · Zone 10A · 30° to 35° F
Zone 6b is on the lower end of the English Boxwood hardiness. I know the last few winters have been unusually cold and very possibly the reason for the yellowing of the leaves. Please don't hesitate if you have any other questions you would like to ask.

4 years ago ·
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