You should be fertilizing your in ground trees 4 times per year while it's warm starting in February. Don't worry about the light green leaves on your lemon, all fresh growth on citrus trees start out a light green and then darken up as the growth matures. 95 degrees is not that hot and full sun is exactly where you want your trees, anything less would be unacceptable. Make sure you're feeding your lemons heavily with a good citrus fertilizer and they'll do fine. I fertilized last week and it was 122 today at my house with little effect on my trees because they're well watered and fed. Don't bother with epsom salt, as long as your trees are getting fed properly they do not need any Epsom salts.

Evan

On my balcony it can get over 40c(104F) in shade, and no affect on calamondin and my only chili bush. All other annuals start drooping but still no sunburn. Usually it stays at around 30c(90F).

During the nights it drops down to 15c(59F) or sometimes even lower than that.

And the amount of blooms and fruitlets, over 30 fruitlets now and counting in a small shrub! It will probably drop some itself. I hope. Half of the shrub has bloomed, other half is filled with buds.

I feed with all purpose slow fertilizer and every other watering with water soluble one, plus some epsom salt and iron sulphate every now and then. The NPK ratio isn't optimal, but so far my citruses are doing well.

When I dont water with fertilizer, I make sure to flush the soil really, really well. Now there's new shoots coming which I've been waiting for the whole spring and summer.

Thanks for all the responses. I must have 10 or maybe more citrus trees in the ground. The best advice I ever received is that all my citrus do not have to go in full sun. Even 1/2 day sun is ok. Actually they struggle in the full sun here in Houston.

Thanks especially for the advice about feeding in the heat. I have found that I don't have to feed any of my citrus at all. If I fed them, they would grow too much. We have year round growing conditions here.

I just had issues with dead plants at Annies Annuals in CA. I bought them in the spring, but as soon as the deep heat started, 4 of the stated Zone 10b plants died. I let them know that these were actually not zone 10b, but actually maybe zone 7 in the south. Zone 10 in CA must be different than in TX. I mentioned to her that we are not able now to even go outside. She said "Yes" they are able to go outside. I am thinking Humidity may be the issue making these zone designations unreliable.

The lemon trees never came out dark green, but were immediately light green. I did feed my peppers with slight epsom salts since I am sort of afraid of it. They greened up nicely.

Thank you guys so much. I will begin feeding these lemons. All the citrus is suffering in full sun while the 1/2 day citrus are quite happy.

I am guessing that you have to buy iron sulphate. My in pot citrus I feed with Dynamite all purpose fertilizer. It was recommended on Gardenweb to buy the least expensive at Seed Ranch (free ship).

Jontte, is your citrus in the ground (bush) or in pots on your balcony ?

HAPPY GARDENING !!

All my tropicals and citruses are in pots, we do get down to minus 25-30 degrees celsius at winters, some winters as low as -40c, so.. My only citrus outdoors for this season is calamondin, it's enjoying sunbathing on south facing balcony. Others are indoors under artificial lighting.

What fertilizer do you use for pots. Carol

Water soluble has 13-7-20 NPK and I dont even remember the slow release fertilizer NPK ratios exactly, but it was close to Osmocote Plus when I lastly checked it out. I add a bit of epsom salt and iron sulphate every now and them.

Not the optimal NPK ratios, but with good flushing, theres no salt buildup or burns to be seen. Yet.

And mulch well to keep heat stress from the tender root zone.