09/03/2026
Perennial Sweet Pea (Lathyrus latifolius): Beautiful… but a Prairie Trouble‑Maker!
There’s no denying that the Perennial Sweet Pea is stunning! Those bright pink blooms climbing over old fence lines and popping along Door County roadsides look like something out of a summer postcard. It’s the kind of plant that makes people stop, take a photo, and smile.
But in a prairie, this beauty comes with a cost.
The Problem Behind the Pretty Bloom
Perennial Sweet Pea (Lathyrus latifolius) isn’t native to Wisconsin. Once it settles into a prairie edge or disturbed soil, it spreads fast, forming thick mats of vines that smother native grasses and forbs. Taking control over the prairie ecosystems impacting pollinators, soil, and wildlife.
How to Remove It (Effectively)
• Cutting Back — Repeatedly cutting vines at ground level weakens the plant over time.
• Root Removal — Dig out the crown and main roots where possible; even small root fragments can resprout.
• Spot Herbicide Treatment — For stubborn patches, a careful application of a targeted herbicide on fresh regrowth can prevent return.
• Monitor Disturbed Areas — Sweet pea loves edges, trails, and old field lines. Keep an eye on these zones.
Removal takes patience and persistence, but every cleared patch opens space for native prairie species to reclaim their ground.
Our ecosystems thrive on diversity, native roots, and plants. While Perennial Sweet Pea may be lovely to look at, it can cause long-term harm.
Education and stewardship now prevents a big takeover later!
Julie Sausen
Master Gardener, ‘25
PC: Julie Sausen
