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not sure where you live Dave but this apple doesn't like clay its not a good cropper at the best of time and is very frost sensitive so id give it careful consideration and maybe do the unthinkable and dig it up and put something a little more suited to your needs hope this helps
I planted and grew a D'Arcy Spice tree when we first moved here in 1994. It took about five years to start fruiting, then I had biennial crops, some so heavy they snapped branches (my fault for not thinning out properly). This is on clay soil too. Your tree looks like it has a bit of weed or grass competition at the bottom, I would try a bit of TLC before scrapping it, clear the square meter around the trunk and feed/ mulch with some nice manure and see how it goes.Have you ever pruned it?
I'm not keen on disturbing the soil, those fine roots working their way up into the fertile underside of the turf are very important to the tree. They are its feeding roots so they affect cropping capacity. A no-dig way to clear the area which I agree should be at least a yard across would be to cut all vegetation to the ground (not strim), cover with a layer or two of mulch matting and two or three inches of wood chip (free on my allotments). Are there any nearby larger trees competing for root space and/or sunlight? If so this will affect cropping if it has not already done so and you will sooner or later have to make choices.Although the picture does show a healthy little tree with good shoot extension this season, it also shows quite a small tree for its age which cannot have had the same good shoot extensions in previous seasons or it would by now be much bigger. Has it has a hard life in the past? If so you must have patience as it seems to be on the right road now.I cannot comment much further because I have no personal experience of this variety, however I must say that the tree shape is rather indistinct. Are you aiming for the traditional open-centre shape or is it to be a centre-leader? Now would be a good time to make a decision.
How do I prune a tip bearing apple tree?
I have had a D'Arcy Spice in my garden since about 1990 and I remember moaning about its poor cropping in the 90s to one of the experts at Brogdale (probably Joan Morgan if I remember correctly) who raised her eyebrows... I'm pretty sure I was treating it well but I am on heavy London clay and Brogdale isn't.It started producing decent crops only a few years ago (still about 50% biennial) but it's never going to be in the top quartile for cropping.However the flavour has always been the most unique one among my 20-odd varieties (most uniquely good I should say - I have been very disappointed by Cornish Aromatic in most years - but then I find Gala simply disgusting - especially the skin).If your tree doesn't have a special flavour (though the sweetness, juicyness and crispness takes longer to appear) then you have to suspect it might not be what it is labelled. Be aware I used several nurseries before I got a true Claygate Pearmain from Scotts (now defunct) and I had more than one mislabelling from Deacons (though that was a long time ago).The apple has a noticeably "dappled" green skin compared to most others with only a hint of yellow at most. It is also sort of lumpy... If I had a photo I'd attach it but the lumpiness is here http://www.adamsappletrees.co.uk/asps/uploads/big/136-2.jpg though it's far too red to be anywhere except on the S side of a free-standing tree.and the mottling is here - sort-of... http://www.kenmuir.co.uk/image/cache/data/Apple-DArcy-Spice-400x400.jpg though you can't see the "threadyness" of the pattern and the shape of the fruit is unfeasibly regular to my eye.If you have a real D'Arcy Spice and it's on clay then now is a good time to move it to some better-prepared soil! I wish I had.Cheers.