Potted Blue Girl Holly: Browning / Loosing Leaves - Knowledgebase Question

New York, NY
Avatar for alysak
Question by alysak
January 10, 2006
I have two blue girl holly plants on my terrace in Manhattan, in a partial shade (shade until noon and after 4 pm, with rather intense sun inbetween). I bought them in late summer and they were doing really well until the temperature dropped to about 30F for a few days. After that, leaves on both plants started turning partially brown and even those that remained green are falling off rapidly when you touch the shrub. I seemed to have followed watering instructions rigorously, the pots are draining well and are large enough not to contrain the root system. I checked for any signs of insects and there seem to be none evident. Any thoughts as to what may be going on and what should I do to prevent my plants from suffering? Any tips would be greatly appreciated.

Answer from NGA
January 10, 2006
Although hollies are quite winter hardy, they are prone to drying out in winter cold and winds, and also to foliage damage due to fluctuating temperatures. The afternoon sun reflecting off a building (or off snow) is especially difficult for them. (This is also a problem in summer when there is truly excessive heat buildup.) It is also stressful for them to be in containers because the roots are not as well insulated as they would be if planted in the ground, both in terms of exposure to cold and also to the oscillating temperatures. The best you can do is make sure the soil is evenly moist but not sopping wet any time it is not frozen, provide protection from winter winds (possibly by wrapping in burlap or using an antidessicant spray) and if possible, move them to a shaded north location where they will be kept at a more constant temperature. Unfortunately, it sounds like your hollies may not make it. This is not too surprising, you will find that most of the container evergreens in the city are replaced each spring. All you can do at this point is to wait and see; it is possible they will releaf during the coming growing season. I'm sorry I can't be more encouraging.

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