One possible reason for your agave's leaves turning yellow is that it is not getting enough water.

Agave Leaves Turning Yellow (Causes And How to Fix it)

HOUSEPLANTS, PLANT CLINIC / By

Agave leaves turning yellow is a common problem that can be caused by a number of factors. The most common cause is a lack of water, but other causes can include disease, pests, or nutrient deficiencies. Luckily, there are a few things you can do to fix the problem.