Yikes, I did this backward! If I had been observant enough to see this post first, I would have answered your palm tree post differently. Both palms and citrus dying means something is drastically wrong in the garden. My first suspect would be a failed irrigation system, though that normally does far more damage in the summer. If the irrigation system checks out, see what chemicals you or a neighbor have sprayed recently. Some "weed killers" kill far more than just the weeds, and can spread underground with heavy watering--the recent big rain qualifies. That may also happen by spreading gravel groundcover that has been "treated for weeds" with the wrong chemicals. Rarer possibilities include major gas leaks (I hope not!), excess gaseous chlorine applied to the pool, or certain other weed killers sprayed on a windy day. I hope we can track down the culprit! Kevin : /

Has anyone looked into the tremendous amount of Aluminum in the air and water from the constant spraying overhead in criss-cross patterns? 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The kumquat tree is outdoors all year as I just don't have a place inside for it. Kumquat are hardy to temperatures as low as -9C (16F) and it doesn't usually get much below freezing here, and when it does it's only for a few days. I also have banana, NZ flax, oleander & fuschia outdoors all winter in pots. Hopefulauth: coldest temp overnight in winter I've seen here is -7C (19F) for a couple nights once. That was unusually cold. Normal overnight temps in winter (Nov-Feb) is about +4 or +5C (41F).

It needs water asap imo. And Vladimir has a good question. Check the soil moisture by digging down with a small trowel. If it's only damp the first few inches, but the trees roots go down over a foot then it's not getting enough water. Depending on your soil it could take a slow soak for up to an hour to properly water the root zone. If it's clay it will take a long time to soak but won't need watering again for a week or more. If it's more sandy, it will soak quickly but need watering again in a few days. Painting the trunk white will help with the temps but it still will need more water at those times. You can also put a patio umbrella over it when you have a heat wave. As far as watering "not helping", the damage has been done and it will take a while, like several months, before it recovers from this. So be patient. Citrus grow in flushes, one to several times a year, depending on the variety. It doesn't grow continuously like a tomato plant does. I would not fertilize at all while it recovers. Instead wait until it starts to grow new leaves, then feed with a dilute liquid food right after watering. The roots were damaged first by the heat and drought, then they could not support the leaves. And also the tree would have drawn water out of those leaves back into the tree to try and survive until it got more water.