Since mid-summer last year, there have been 2 rhodos and 2 pieris sitting in the shaded area under my walnut. This was to have been a temporary (two or three week) situation, but they wound up passing the winter there. The walnut is out in full leaf (and has flowered);so far, my ericacea seem really happy. This is my concern: can I expect much more bliss in this corner ? (It would be difficult to move them right now.) The walnut is about thirteen years old, 23 +/- feet tall,and 23 feet +/- across. The ericacea are 3 to 5 feet tall & 10 to 15 years old. I'm surprised at the current (early) lack of juglone damage, but maybe it's too early in the season. Any advice/relevant experience?