Citizen Science
Spotted one?
Log it. It matters.
Eastern prickly pear is endangered in Massachusetts. Every observation becomes part of the scientific record — and helps build the case for protection. You don't need to be a botanist. You just need to show up.
Field ID Guide
How to Identify Eastern Prickly Pear
Year-round
The Pads
Flat, low-growing cactus with thick green pads. Stays close to the ground — rarely taller than 12 inches. Covered in fine bristles (glochids) and occasional longer spines.
June – July
The Flowers
Brilliant yellow flowers, 2–3 inches across, with many petals. Unmistakable when in bloom. Each flower lasts only a day or two.
Fall
The Fruit
Red-purple fruits (tunas) in fall. Oval, about 1–2 inches long. Edible but covered in glochids — handle with care.
Always
The Habitat
Sandy, sunny, open areas. Roadsides, dunes, cemeteries, trail edges, coastal scrub. Full sun is essential — it won't grow in shade.
Where It Grows
Known Habitat Zones
Eastern prickly pear has been documented across the Outer Cape in these habitat types. If you're looking for it, these are the places to start.
- Open dune and sandplain habitat
- Sunny, sandy roadsides
- Historic cemeteries with sandy soil
- Coastal scrub edges
- Trail margins in open pine-oak woodland
Eastham, MA
Sunset at Rock Harbor Beach, Eastham
Photo: Jack Garvey
How to Report
Three Ways to Log Your Find
iNaturalist
Best from your phone
Log at iNaturalist.org or via the free app. Search "Opuntia humifusa," add a photo and GPS location. Your observation is reviewed by the community and becomes part of the scientific record.
Open iNaturalist →MassWildlife Heritage Hub
Official state record — desktop only
The Heritage Hub is the official channel for Massachusetts Endangered Species Act documentation. Note: reporting is only available via computer at this time — the site does not work on mobile.
Open Heritage Hub →Tag Us on Instagram
@capecodcactus
Tag @capecodcactus with your photo. We want to know about every sighting — and we'll help you log it officially if you need a hand.
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