Slender Yellow Wood-sorrel

Year-round

Southern yellow woodsorrel is a low, clover-leaved plant that takes care of itself in the Detroit area. The main job is not helping it grow, it is keeping it in bounds, because it reseeds fast. Give it sun to part shade and average soil and it will do the rest.

• Establishment: it settles in on its own from seed or a small plug in spring. No special soil prep needed. It handles poor, dry ground as well as good garden beds.
• Watering once established: water only in a long summer dry spell. Normal Detroit rainfall is plenty, and soggy soil makes it flop.
• Self-seeding management: the seed pods fling seed several feet when they dry. Pinch or shear off the pods before they brown if you want to keep it from spreading into the lawn or neighboring beds.
• Common mistake: treating it like a fussy perennial. Overwatering and rich fertilizer make it leggy and floppy. Lean and dry keeps it tidy.

Fall

As Detroit cools in fall, this plant keeps setting seed until frost. A light cleanup now keeps it from carpeting the yard next spring and keeps the front bed looking cared for.

• Cut spent plants back to a few inches once flowering slows, and rake up dropped seed pods to limit next year's seedlings.
• Do a final pass to remove any plants that wandered into the lawn or a neighbor-facing edge.
• Leave a few plants standing if you want them to reseed on purpose in a spot where you want more.

A tidy fall cutback and cleanup reads as intentional to an HOA and helps you avoid a violation letter over a plant that can look weedy once it browns.

Winter

Detroit winters knock this plant back to the ground or kill the tops off entirely. There is almost nothing to do, and that is normal.

• No watering, no covering, no protection needed. It overwinters as seed or hardy roots and returns on its own.
• If you did not cut it back in fall, clear the dead brown stems now so the bed looks neat through the bare months.
• Expect bare ground where it grew. New sprouts show up on their own once spring warms the soil.

Clearing the dead winter stems keeps the front bed looking intentional and cared for, which is the simplest way to stay HOA-friendly during the bare season.

Spring

Spring is when new plants sprout and old ones green up around Detroit. This is the window to plant a plug or thin out a patch that got too thick over winter.

• Plant or transplant small plugs after the last hard frost, usually mid to late May in the Detroit area.
• Pull or dig out any seedlings creeping past where you want them while the soil is soft and roots are shallow.
• Hold off on fertilizer. This plant grows better lean, and feeding it just makes floppy growth.

Summer

Through a Detroit summer this plant blooms small yellow flowers and sets a lot of seed. Watering is rarely needed, but this is the key season to stay ahead of self-seeding.

• Water only during a stretch of two or more dry weeks. Otherwise let summer rain handle it.
• Shear or pinch off the ripening seed pods every week or two if you want to stop it from spreading into the lawn and beds nearby.
• If a patch gets leggy in the July heat, cut it back by half and it will regrow fresh and lower.