If you are encountering issues growing your cashew tree... the culprit could be the soil type.

Please consider the information below obtained from the University of Florida
When the soil is good, like in deep sandy loams, cashew trees have a big, strong taproot. But in Miami-Dade, where the soil is thin and has oolitic limestone underneath, the taproot can't grow much. Instead, cashews grow a lot of roots that spread out really far from the tree.

SOILS
Cashew trees are well adapted to many well-drained soil types, and trees growing in light sand and limestone soils produce satisfactory yields. However, cashews grow best on deep, well-drained, sandy soils with a pH of 4.5 to 6.5, whereas trees growing in the limestone-based soils (pH 7.4–8.5) of Miami-Dade County may develop nutrient deficiencies of iron, zinc, and manganese. Cashew trees are moderately tolerant of occasional flooding and can withstand excessively moist soils for brief periods, but will fail to thrive on poorly drained soils.


WARNING: Cashew trees growing in the limestone-based soils (pH 7.4–8.5) of Miami-Dade County may develop nutrient deficiencies of iron, zinc, and manganese.

Possible solutions:
Use mulch around the base of the tree
Appy fertilizer with micronutrients -- consider our fruit tree fertilizerhttps://everglades.farm/products/fertilizer-for-fruit-trees-granular-n-p-k-with-micro-nutrietns?_pos=1&_psq=fertilizer&_ss=e&_v=1.0
Consider growing your Cashew tree in a container
https://help.everglades.farm/en-us/article/how-to-grow-fruit-trees-in-containers-mo4ti2/