Quite often the deficiency comes about as a result of overfeeding. The nutes are locked out at the roots. They are available to the plant, but the plant can't absorb them. There are products available to help flush this chemically, but this may have gone too far. If it were me I would leave them alone and see if they sort themselves out. Faerina is right in saying that it would be unusual for a plant to 'starve' in the ground. Personally I rarely feed outdoor plants.
If you have a problem with weed and you're not sure if they are overfed or underfed - it is almost always that they are overfed. Try and imagine how this would grow naturally. Less is more.
If you have a problem with weed and you're not sure if they are overfed or underfed - it is almost always that they are overfed. Try and imagine how this would grow naturally. Less is more.
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