Jude does better as grafted-on-Dr.Huey, esp. for alkaline clay. I grew 2 Judes as own-roots in my alkaline clay, Jude hated that. But Jude improved when I fixed my heavy clay with coarse sand, which fluffs up clay forever. In contrast, organics (peat moss, compost, alfalfa, leaves, wood chips) would de-compose and glue-up with clay to choke out wimpy own-roots like Jude. I tried everything (including perlite, gypsum, alfalfa hay) to fix my high-magnesium heavy clay, and coarse sand is still the best. I dug up spots in my garden where I fixed heavy clay with coarse sand, and 15 years later, it's still fluffly. I planted 5 white-pine-trees, one tree fixed with coarse sand is over 30 feet tall & dark green a decade later. Two trees in heavy clay died, the others became chlorotic (pale & yellowish). When the soil is made fluffy with coarse sand, leaves are dark-green, and roots can go deeper. Folks use coarse sand to root roses. NOTE: there are many different types of clay, thus different ways to fix them, my clay is dolomitic (high in magnesium & calcium), and I'm next to limestone quarry.