I used to help Paul Schubert of the Philadelphia Botanical Club monitor some sites for the USDA in Camden County. Here's an excerpt from his recent e-mail to me:
"... David and I monitored Big Timber Creek last year, where it took us awhile to even find that population. You will remember that Mike Hogan showed you and I where that one was/is. Well, it still took us awhile to find it, however.
And this year, just last Saturday, David L and I (plus his girlfriend) took care of both our original site, Slab Bridge - which has but some (as of this year) 5 rosettes (one with 3 blooming plants, none of which are more than a foot high) and Tom's Branch - which may have exploded with growth this season, or so it seemed! We counted some 130 single plants there, many, many rosettes none of which, however, contained more than 6-9 rosettes. And there also, while at this site there were some 10-15 blooming plants, none of these blooms were anything close to the full 2' height of a really healthy helonias bulutta. Please also know that the Slab Bridge site's stream water is currently flowing like a mud-sludge; something really has affected this hydrology there. ..."
So they're blooming now on these tributaries of Timber Creek in Camden County.
It seemed that at the several sites down there that they grew near the waterway's beginning, on land not submerged, but next to running water, often surrounded by Skunk Cabbage.