Lack of light

House plant species are sometimes placed in parts of the house unsuitable for their ideal growth. For example, a poinsettia needs high light levels. Plants outdoors may be subjected to the same oversight. Pelargoniums used as bedding plants should be given full sunlight and

Figure 15.22 Blossom end rot in tomato. The fruit at the opposite end from the stalk has a typical black sunken appearance

Figure 15.23 Raisedoedemaspots on lower leaf surface of pelargonium. This symptom superficially resembles rust pustules will develop a pale foliage colour if placed in a shady place. Impatiens, on the other hand, is able to withstand considerable shade and maintain its rich dark-green foliage.

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