Ok, I found this from the link below: "Put the rhizomes about an inch into the ground and space them about a foot to a foot and one-half feet apart. Since they multiply, one this year likely produces two or three in the next year. Over a couple of years a clump will form. If it grows too tightly bound, the blooms diminish. "
Might they have been planted too close initially, thus by the second year they were already a bit tightly bound? Since it has now been 5 years, I imagine they would benefit from being dug, divided, and reset with the appropriate spacing so they won't get too crowded too soon.
Chemocurl zn5b/6a Indiana
hibiscusfan -Northwest OhioOriginal Author
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Chemocurl zn5b/6a Indiana