mountain ash is very tolerant of water. i have one grafted over to pear. theres water around it for at least half the summer and all winter and its been a vigorous grower.
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How about cold hardy citrus? Just have trifoliate as the rootstock.
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I assumed that building a mound meant simultaneously digging a trench nearby
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Usually the logic is to put good soil not more clay. Though if theyre clay tolerant sure
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What about growing this in the water collectors for rabbit, chicken or quail etc. feed
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Haskap? Those do fine in clay on my zone 8b allotment, on clay, but they don’t like drought.
Ribes species, like blackcurrant seem to be very good at rooting from any point on their stems and can grow in boggy forests. If you want something bigger, josta-plants grow really fast. Just put any prunings in the soil and you’ll quickly have a row of plants.
Blueberries and cranberries depend on your pH of course.
Highbush cranberries (Viburnum) and (European) elderberries should definitely work. They grow on the sides of ditches here and are happy in clay.
Some blackberries will grow anywhere.
I agree with other posters that it could be nice to make some ridges to create wetter and dryer spots. If you want to grow sea buckthorn, you could even add some bags of sand and plant them on a mound. In the wild, on our pretty wet coast, they grow in pure sand in places with a high water table.
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In Michigan I took care of a Highbush Blueberry planting next to a stream. The rows were raised about a foot, but lower in some places, and the whole thing flooded all spring and sometimes had standing water into summer. Very productive bushes.
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