Had these trees for 3 years in nice big clay pots, 1- dwarf lime,
Actually, citrus can be "heavy feeders", requiring frequent light feeding when grown in containers. This is because their requirement for good drainage means nutrients leach out of the potting mix.
Feed lightly once a month. Water first, then feed, then water again. NEVER feed when the pot is dry!! Use a commercial citrus food.
However, current citrus foods lack zinc, which citrus needs. Try to get some zinc sulfate and add about a tablespoon with each feeding. A lack of zinc in the soil can cause bud drop before flowers open. (This is also a problem with gardenias.)
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