Makes it tough too when you don’t have all the equipment to do what I said. Radishes and turnips will definitely help the top foot. I planted some grapes in clay at my house and some grapes at my farm. The grapes in the clay have been a struggle. I don’t need them there that bad or want to put in too much effort at that spot, they are what they are saying until they die.
Lucky_P sent hickories. There’s a new shagbark (don’t know if in commerce yet) named Happy Hollow that cracked really good. It has as nuttiness flavor that was very delicious. It was last night’s clear winner of all new stuff we cracked. His Samsung phone sent photos to me and my computer doesn’t accept them. I finally found 1 of 5 photos in ‘My Music’ but the pixel reduction was ‘automatic’ and I lost all the power to zoom in.
I’ve never given him a present but I built one of these portable nut cracker bases for Gary and have been buying all the ‘May Nutcracker’ that comes up on eBay. Now he has a portable pecan cracker to carry in his truck.
I was at his place till 1 in the morning. We talked for 5-hours and it was fun.
Honestly, I don’t know what I am doing different than you. If I dig down right now I would have those puddles of water as well. The only thing I can say is I did raise about 1 foot of a raised bed using compost but that has now settled down to maybe 4-6" above the surrounding ground so what contribution it is actually doing to keep roots above water I do not know.
In your situation, I would try a raised bed option. Try to get 1-2 foot tall mounds by say 3-4 feet wide and see what happens. You probably do not even need to dig up your plants to replant higher because if you bury them they should root from the trunks.
With regards to all the discussion of breaking up the clay for drainage and the like, unless you do the whole property and your neighbours OR you have connecting drainage doing a small section around your grapes will probably not do much. I have also seen no problems with grapes shoving roots wherever they want. They dig through clay no problem.
In Texas we had a heavy clay soil. My dad tilled in tailings from a a friend’s horse stalls - sand, hay, and hockey. That worked well. I tilled in Peat Moss and that worked well for me too. You just need to get some way for the water to get to the roots and for the roots to go somewhere. Make sure you do have a drainage path out so you don’t turn it into a bathtub. I just did the same thing to a new garden I made here in Oregon. The ground was highly compacted clay and I tilled down a food then added 6 cu-ft of peat moss. A front tine tiller makes things easier but it is still a lot of work.
your clay looks alot different than mine. here its usually reddish but the blue shale clay is far worse. if you want to seal the bottom of a pond here just find a blue clay vein and line the bottom before filling. the natives made pots from the blue clay, it was so dense. nothing will grow where there is pure blue clay.
Mines looks similar to Barslips. In the worst spots/veins–chunky and opposite of friable–almost like pottery clay, but not quite as bad as what you’re describing. My clay is on hillside though, so maybe it’s a bit more forgiving.