Some trees will grow next to walnuts - see link below. I planted a few acres of walnut seedlings in one area of my reforestation project and used the list to determine which trees I could mix with the walnuts. I planted a lot of oaks, redbuds, and red cedars mixed in with the walnuts to add some variety, but several others will do fine next to them as well. Another option would be to remove the walnut tres and replant the spruces. I've read the juglone lasts 2-5 yrs in the roots/soil after the tree is killed so the new trees may get off to a slow start until the juglone totally fades away. john Here is a link that might be useful: Walnut Trees

My young tree is approx 10ft and 3-4ins trunk. As it got taller I realized it was a beautiful walnut. It's about 1-2 ft near a fence. I have pruned the branches so they don't intrude over the neighbour garden. I thought about about moving it ,but after reading comments I'll just carry on pruning it as I don't want to lose it now it looks happy.Each side neighbour had a huge walnut in their garden when the houses were built in 1974 and they cut them down after they moved in. So I'm surprised and happy 😁 I've got this one growing now.

I have had the same issue with the native pecan trees, in Texas. The oak leaf hydrangea lasted three years. I love roses, but haven't tried them, yet. I didn't want liriope, but it moved in, and is doing quite well, much to my chagrin. But I have a thing about removing living things, so there they are! 😀 I've experimented with several native plants, and have found that yaupon, Turk's cap, (aka Mexican apple) does well, as do Christmas fern, St. John's wort, and artemisia. Daffodils, lily of the valley, and bearded iris have survived thirty years, with absolutely no help, as have the rosemary bushes. Oak trees, redbuds, and Eve's necklace have been next to the pecan trees, for thirty, to fifty years. Sadly, the mints, bee balm, and lemon balm only made it two years. On the upside, I've seen non-natives that have survived at least twenty-five years, such as Japanese boxwoods, nandinas, and ligustrums. The gardenia bush died within three months, even though I pampered it. Juglone is a real bugger, but the pecan tree is our state tree, the birds love them, and they provide a squirrel circus that is often hilarious! Loved your article, Hawkeye_Belle! I love roses so much, and I've spent thirty years wondering whether my pecan trees would do them in. You've provided some excellent information!

I planted climbing hydrangea at the base of the limbed up bk.walnut 2 years ago. So far no 'juglone effect' had been noticed. How other hydrangeas will react to it is unknown to me. Separately, re: Unique. As far as I'm concerned no true 'Unique' is offered in US by mass merchants. To be sure you have a real thing you should obtain it only from the hydrangeas specialising companies only. To some extend, now widely available, Quick Fire could be considered as a fairly decent substitute, IMO.