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light leaves on petunia plant

I have about 15 pots of annuals outdoors (OHIO). One petunia plant that is planted with a Gazania has developed light green leaves, but still blooms well. The gazania is doing great. This pot has been fertilized the same as all the other pots. The pot they are planted in is tall, thin unglazed light colored clay pot. I'm thinking that the gazania loves the heat, but the petunia doesn't. Can you think of any other reason why this plant has developed the anemic leaves?
Submitted by BHGPhotoContest

It's likely your petunia is suffering a bit from cooler than average temperatures. Once the temps warm up it should green up. However, if these plants are jammed in one pot together it might need some fertilizer to get it going. I'm guessing the problem is the weather, but if you want to sprinkle in a little dry, slow-release granular fertilizer such as Osmocote go ahead.

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