How to care for roses
There are many reasons why knockout rose leaves can turn yellow. This is an important problem and it will need solved immediately. The leaves help the plant breath, and without them it will surely die.
One reason why knockout rose leaves can turn yellow is because of extreme temperatures. Because these roses are not resistant to cold or heat, the leaves will turn yellow and fall. What you need to do is move them in a plate where the temperature is more moderate.
Watering the plants
Water is also another reason. If you over water the plants, then the roots can drown and make the plant not work properly.
Roses are quite sensible to soil pH. You will need to keep a balanced one in your soil in order to maintain the rose healthy. You will need to use moderate fertilizers and not very often. The roses will need a lot of nitrogen.
Other reasons for leaves turning yellow are diseases.
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