Answer: I'll bet your cats think you're a great gardener! Ajuga (Bugleweed) is easy to grow, and is an eager groundcover (some would say "beware it's enthusiasm"); Dryopteris cristata (Crested Wood Fern), Onoclea sensibilis (Sensitive fern) and Osmunda cinnamomemea (Cinnamon fern) are certainly tall enough to hide your feline friends (unless their of the cougar variety), but they need a woodland-type soil that is at least loose, if not moist. Astilbe enjoys shade and provides color as well ascover. All are low-maintenance, tolerant of black walnut, and easy to establish in the right soil.
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