为你“我”受冷风吹

买来才一周多的海棠花在前几日突然出现叶枯和倒伏的症状，花朵倒是没谢，可看上去也是锈迹斑斑，没有了刚来时的朝气。

赶紧在网上查找养这类海棠（RIEGER BEGONIA）的注意事项。这类海棠并没有特别需要注意的地方，湿度、光照、虫害，这些都不是这盆海棠出问题的诱因。我仔细检查了海棠的放置位置，我把 它放在靠近暖气同时又是窗口透冷风的地方，这是个冷热不均的位置，一方面外面的冷空气透过我刻意虚掩的窗缝吹近来，一方面暖气的热量也在这个位置进行总循 环。任何一种植物抗热和耐冷都是相对的，我放置的这个位置则属于冷热不靠，别说植物，就是一个壮汉在那儿待一个礼拜，估计也会因忽冷忽热而身体不支的。

我只能把海棠移到一个恒温的地方，用几根细竹棍把倒伏的花枝撑起来，然后修剪掉一些枯叶；同时对自己的大意而向海棠说声抱歉，并期待它修养将息后重放光彩的时刻。

Care:
Rieger begonia does not grow in hot humid regions. It prefers cool temperatures of 70F during the day and 60-65F @ night with bright indirect sun (east window); that’s why it’s a popular winter flowering plant. Grow it in well-drained peat/perlite soil mix or African violet soil and feed with ?? strength houseplant fertilizer every 2 weeks when actively growing. When watering, let it to dry slightly between watering but not too dry or too wet
Be sure to remove the spent flowers to stimulate new bloom.

Re-blooming Once the plant slows down and stops blooming, cut it back to several inches above the soil line and place in a cool, medium light area, keeping on the dry side or place it in the shade outdoors during the summer. When you see new growth, repot the plant to a larger container, move it to bright indirect light and start watering and fertilizing. Rieger begonia responds to short days and cool night temperatures (fall/winter) which stimulates it to bloom again.

Trouble-shooting
-Direct sun will scorch the leaves
-Too much light will turn the foliage a copper color, then brown.
-Avoid getting water on the leaves as it can cause powdery mildew problems.
-Too much fertilizer will turn the foliage blue green and curled at the ends.
-Overwatering with low temps causes leaves to wilt and turn brown.
-Keep away from heating vents or cold drafts.

(http://hortchat.com/info/grow-rieger-begonia)