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)

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.