Have you tested the soil PH in your Eureka lemon? Some rootstocks can be more sensitive to soil PH than others. If you know the rootstock it is grafted to, you can look it up and determine what kind of soil helps it thrive.

Pictures would help a lot. Pull it out of the pot to check root health. It may have a large part of it root base that doesn't absorb water.

Steve

Hi, thanks for the replies - sorry i thought i attached the photo, let's try again...

I don't know what root stock it is, I'll try and ask the company i bought it from because that sounds like a plausible explanation.

that maybe the only way other than find branches of the root stock

A lemon tree certainly needs much more fulfilling nourishment than seaweed extract.

This poor tree is underfed. Find an actual fertilizer higher in nitrogen and potassium and lower in phosphorus with trace minerals and fertilize the tree. Doing so the tree will repay you a hundred fold.

I'm starting to get get it to grow in my flowerpot of clay soil my clay soil must have been poor

Hope it helps. Just make sure that the tree is getting the right amount/type of fertilizer, water, light, etc. If all of that is held constant and your other citrus are doing well and this one isn't thriving, then it could likely be that the rootstock on that tree is a bit more on the sensitive side. If soil PH is off for a particular rootstock it can be difficult for that tree to take up nutrients no matter how much fertilizer you throw at it. There's a lot of good information on soil types for different rootstocks from UC riverside, I believe. I have a kumquat that was doing the same thing until PH was mentioned and sure enough that specific tree had some difficulty where my others didn't. I'd probably check the roots first, like Steve mentioned, if the roots are compacted and some of the rootball is staying dry it won't be taking up nutrients, which can also cause your issue. But if the rootball is fine, I'd probably check soil PH and figure out if your tree is just a bit more on the sensitive side. From there I'd probably look into other factors.

my lemon seedlings are now not root bound

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A p.H of 6.5 is optimal for citrus. This being said, citrus trees all over the world are growing well in pHs between 6 to 8. Still one should try to provide the best condition for every tree.

Hi everyone, some really helpful comments! So when i watered yesterday, I then gently pulled it up, and the roots are actually looking really healthy, new growth and not compacted - the water has soaked all through. I don't think it's lack of fertiliser - it gave the seweed on top of the special citrus summer fertiliser i use every other water (rainwater as we're quite alkaline here), so at the moment that's every other day - and my other trees are loving it! Next step is getting a pH kit in case there's not quite enough ericacious in the mix.

Isabel,, you should have wrote that besides the seaweed you also use fertilizer. Then I would not had to wright my post.

Silica Many other will read it and gain from your advice.

Steve