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travisaz

Meyer lemon leaf droop and watering 101 questions

Hi all,

thanks in advance for your advice. It seems I ask a new question here almost daily.

My first question has to do with leaf droop. My Meyer lemon put out a lot of new growth in the last week or two. Several new branches flush with tender green leaves. At the same time, we hit a heat wave in Phoenix. Almost overnight we jumped from high 70s/mid 80s to upper 90s/low 100s. This seems to be too much for my young tree and it is drooping significantly, particularly among the new growth. I noticed this morning it was already drooping when I checked on it at around 9 AM (about 90 degrees outside). Overnight lows are mid to upper 60s, so I don't think the problem is the leaves warming up before the roots. It perks out of it in the evening as the temperature comes back down. I understand this is probably a normal reaction, but I'm wondering what I should do about it? Should I pull it out of the sun, or let it acclimate through experience? it typically gets morning and early afternoon sun, from about 6AM-2PM.

My second question has to do with the yellowing I am observing on some of the older leaves. I initially thought this was resource management, that it, the tree taking from old leaves to feed the new growth. But it continues to spread, and is now impacting a half a dozen leaves instead of the oldest one or two. They do seem to be concentrated at the bottom of the tree. I use Arizona's Best Citrus Food (CRF), about 1/8th cup around monthly. I also use Foliage Pro in every couple of waterings. So I don't think it should be a fertilizer issue, but that is what the yellowing pattern looks like to me.

My big fear is that it is a watering issue. I use a modification of Al's 5-1-1 mix--mine is 5-2-1 because I live in a hot and arid desert. It drains fast, the pots have good drainage. I water deeply (until I see good flow out the bottom) at each watering, which has been every 3-5 days. My wife thinks I don't water enough, but I worry I water too much. I tell myself I don't have to worry about overwatering with this mix, but....

To test for watering, I'll stick my fingers in the top couple of inches and check for moisture. The surface is completely dry (as evidenced by touch and appearance--it looks dried out). But just underneath that the soil has a darker color indicating moisture. It will feel a little cooler, and be crumbly to the touch. If it doesn't feel "wet," I'll go ahead and water. Should I be waiting until it really dries out like the sky-facing surface (and looks dried out)? Is overwatering a real risk with this mix?

Thank you thank you thank you 😁.

Comments (14)

  • 6 years ago

    My brother lived just out side of Phoenix in Down town metropolitan Waddell. Az just east of the white tank mountains. Move your tree so its sun end by 11:AM. You may have to soak the entire pot to make sure the entire root ball is wet. In your temperature root rot from wet root not drying will not be a problem.

    Steve

  • 6 years ago

    Thanks Steve!

    I live just a little south of Waddell, also on the east face of the White Tanks. How cool.

    I'll reposition the pot so it gets less sun exposure. Is that going to help with the yellowing, or the drooping, or both?

  • 6 years ago

    What yellowed will eventually drop but it should help.

    Steve

  • 6 years ago

    Arg! this poor tree is still drooping. I tried double-potting it, now I buried it. It is still struggling. Should I try putting up a shade cloth? Root temps are in the mid-80s. Do I need to just take a step back and let it be? I've been keeping the soil moist (not wet), but it's fast draining and with high temps. Tree perks out in the evening so I don't think it's an overwatering issue.

  • 6 years ago

    @CA Kate z9 are you suggesting I bury the pot more (add another layer of mulch or rocks), or affirming that putting up a shade cloth will help?

  • 6 years ago

    What you need to do is get the pot itself out of the sun. You could put somethng in front of it , around it, or, as you have done, bury it. I have all my plants in pots: trees, veggies, flowers, you name it. The one thing I've learned is that the pots can't sit in the sun all day and get roasting/streaming hot; the plants will die. Mostly my pots are bunched together so they provide shade for each other, as well as a cool-mass; others have afternoon shade... hottest part of the day. I find that terra cotta gets the hottest, but considered the best because it breathes. My trees are in huge pots; all my plants are in pots much larger than what would normally be considered acceptable. I suppose that helps too.


    Travis in PHX (9b) thanked CA Kate z9
  • 6 years ago

    That's interesting what you say about terra cotta being the hottest. I picked a terra cotta pot because it was affordable in the big size I wanted, and I thought they were good for hot environments (probably because of the porosity you mentioned). Maybe I'll revisit wooden planters.

  • 6 years ago

    You can paint the pot white and it will solve your problem.

    Steve

  • 6 years ago

    That is easy to do! Will be done tonight or tomorrow.

  • 6 years ago
    last modified: 6 years ago

    The plastic composite pots are better, they won’t transfer heat.

    if it were me I’d lose the pot and just bury that sucker in the ground. My Meyer on standard rootstock is only 6’ tall after being in the ground for 3-4 years. If someone from your HOA asks you any questions just say “what tree? That’s a ficus.....don’t mind those yellow ornaments hanging from it.”

    You could hide this right?


    Meyer lemon tree · More Info



    Meyer lemon tree · More Info


    Evan

  • 6 years ago

    That's a fabulous looking tree Evan, I'd love to hide that in my yard!

    I buried the pot last night and it looked awful today. I think I need to pull it out of the sun and give it shade for a few days, it's obviously stressed and none of my efforts to keep it cool and still get some direct sun have worked. I've lost about half of my baby lemons and several leaves in the last 4 days or so.

    I put it back under my porch tonight and will keep it out of direct light. Then maybe I can put it in a cooler pot (don't want to disturb it's roots though) or devise a way to effectively keep the current pot cool.

    Meanwhile, the grapefruit tree in a matching pot doesn't seem to care that it's gotten hot this week.

  • 6 years ago

    Meyers are finicky in pots, you may be better served to try a Lisbon or eureka lemon, they do well out here in the desert. I lost my first Meyer that was in ground, I think it may have been scion incompatibility mixed with being planted too deep in the ground. I’ve learned a lot since then. Your grapefruit tree will love the heat, they need it to make sweet fruit. I’d leave your Meyer in the shade for a few days and let it get used to the weather and slowly move it into the sun. According to the container gurus here on the forum the more you move meyers around and change it’s sun exposure the worse it is for the tree.

    Evan

  • 6 years ago

    Thanks Evan. I've been worried about all the movement. I think regardless of outcome, I'm going to leave the pot be for several days in the shade of my porch.