Yellowing can also be too wet with the plant feet, bulbs left in ground like amaryllis, tend to bury themselves deeper each year. Magnesium can also be amended with epsom salts. (Nitrogen would more likely look like a burn- browning)
Houston, where I am close to, varies from drouth to flood. Hard on every plant. Yet we spend more time with chainsaws and backhoes clearing out the underbrush - and gators and hogs- and learn not to shoot ourselves over weather or plants.
All plants leach nutrients from the soil they live in. When those conditions change, a new plant springs up that needs a different set of conditions and so the new plant thrives- For awhile. From weeds, to flower, to prairie to brush to forest each plant provides for the next part of the chain. Just as it takes, it leaves.
Okay looks like I need to know what to do with acorns...
