Summon the power of the Sheeb. :-)

It's April--go to the Valley Garden. If you do a search for "Greenville DE," 5 of the first 6 boxes listed are there. (One of Dancing Bat's Grateful Dead boxes might still exist too; I'll message you.) Beautiful location, variety of planters.

Powderfinger is worth a special trip. It was planted by hexacat, who did some really awesome boxes. Plus it's at the Hagley Museum, where the DuPont company started. So there's a fee but you get to tour the mansion & the company's original offices, see how the workers lived & exhibits on how they made gunpowder.

Alapocas Woods has FishMan's Cliffhanger series & several fun boxes by geckospot. And maybe something older. ;)

Brandywine Creek State Park is a fertile spot too. 3 or 4 good planters there.... :)