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How to identify deficiencies in container plants
Check for poorly defined green shoots, yellowing older leaves and premature leaf drop.
If these are present, this indicates that the pot plant has magnesium deficiency. Remedy by spraying a mixture of water and some dissolved epsom salts to the soil and on the plant's leaves.
Try to spray under the leaves for better absorption. Look for spindly growth and dropping leaves that turn red or purple.