They are queen palms and probably need fertilizer. I would give them epsom salt first and then some fertilizer a week or 2 afterward. Queen palms usually dont look very good when left uncared but with fertilizer it should keep the fronds greener. Just remember that the fronds that are already yellow will not get greener. Only the new fronds will be greener.

good luck!
-Alex

Thanks Alex. So I tried to do a little research on what's the proper amount of epsom salt to add per gallon of water. I saw anything from 1 teaspoon to 1 cup. What's your advice on application rates?

Thx, Richard

When I added epsom salt to mine I didnt measure but I was not a huge amount. Probably around 3 or 4 teaspoons. This is my first year using epsom salt so Im not sure if thats enough but the less the better for now because you can always add more in another month or 2 after seeing if there are any improvements. But I think 1 cup is too much for just a gallon, but I could be wrong.

Good luck!
-Alex

thats the typical look on a queen palm here in so cal if not taking care of properly but than again most people, not all mainly water them every so often. it might need a good soaking since there was no irrigation & if the ground looks really dry but i agree with TZ7 with the epsom salt and a slow release fertilizer. regular water & fert. should turn this palm around in no time, there are thousands of queen palms all around especially by where you live & if taking care of they look really beautiful! goodluck

my coconut palm trees are dischargin sap tha's stiking to the floor, its clear and the flowers and little coconuts are dry, it's very dry in florida,
please let me know what can I do.Are they sick?
Thank you

Im going to say that its probably aphids. Aphids can kill plants because they make a sap (which ants love) that will keep the leaves from getting sunlight (not to mention that they are sucking the life out of the plants!). Neem oil seems to help, but I would try to find a professional to spray it because it sounds like a pretty large palm.
Good luck!
-Alex

I can't see the Queens very closely in your photos, but what I can see of them they look OK. IF only the bottom fronds are yellowy, they may just be old fronds. Hard to really overwater a queen palm in California, even if planted in mud, but I guess it's possible.. most queen palms in So Cal do not get enough water, but too much is rarely a problem. the biggest, thickest and healthiest are those growing in well watered lawns.