They are not heavy feeders and can be kept in good health with a standard 3-1-2 ratio fertilizer such as 15-5-10 or similar blend. Feed them with a light application by sprinkling about 2 tablespoons of fertilizer throughout a circular area extending about 2 feet out from the trunk around each plant. Feed them in early spring and again in early summer.
Epsom salts is fine if the soils in your landscape are often low in magnesium, otherwise it is not helpful. A soil test is the best way to determine nutrient levels. If magnesium is needed sprinkle a tablespoon of epsom salts in the area described above and then water it in well.
The only practical way to tell male from females is when they bloom which is a very uncommon occurrence.
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