I’m New To Arizona Landscape. My Agave Is Turning Yellow. It Wasn’t Getting Watered, But I Thought That Was Ok. The Ends Have

Question

wave-like black spots on the bottom leaves. Is this fixable? I love agave, just don’t know proper up keep. It is shaded by the house until about noon then has sun until sunset. I’m unsure how long it has been here as we moved in only a few months ago. It is quite big and has three smaller plants below it that are also yellowing. It is about 6-8 feet away from the pool. Some leaves have white crusty (calcium?) stuff on them.

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Answer 1

I would test that soil. It looks a bit like nutrient burn, but it could be that the soil is too compact and holds too much moisture under.

It looks to be infected with downy mildew, as well. This can happen if it is overly humid.

Here are some articles that will help you, here:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/ornamental/cacti-succulents/agave/growing-agave.htm