Roundseed St. Johnswort

Year-round

This is a small native wildflower with clusters of bright yellow flowers for most of the summer. It is easygoing about soil and needs very little care once it settles in.

• Plant it somewhere with full sun to light afternoon shade for the best flowering from June through September.
• It grows in average garden soil, sandy soil, or heavy clay, and prefers to dry out some between waterings.
• Bees visit the flowers often, so it is a good pick for a pollinator-friendly bed.
• It spreads slowly on its own by dropping seed and by shallow underground stems, so give it room or plan to thin it every year or two.

The flowering stems can flop over a bit by late summer, so pairing it with a lower groundcover or a light stake keeps a front bed looking neat.

Fall

Fall is when the plant finishes blooming, ripens its seed, and starts shutting down for winter as nights turn cool.

• Seed capsules form and ripen through October after the last flowers fade, so collect seed heads now if you would rather control where new plants come up.
• As nights cool toward the average first fall frost for the Hot Springs area, around November 1, top growth starts to brown and die back on its own.
• This is a good window to divide or thin an overcrowded clump before it goes dormant for winter.

Cutting the browning stems back in fall instead of leaving them up all winter gives a tidier look for an HOA-conscious front yard, if a neat appearance matters more than winter interest.

Winter

Winter is quiet dormancy for this plant in the Hot Springs area's mild zone 8a climate, and it does not need protection from the cold here.

• Hot Springs falls in USDA hardiness zone 8a, well inside this plant's typical hardiness range of zones 3 through 8, so no winter mulching or covering is needed for cold.
• Top growth dies back to a woody base most winters and returns from the base again in spring.
• If old stems were left standing through fall, cutting them back in late winter before new growth starts keeps the bed tidy for the coming season.

The plant dies back to bare stems for winter, so pairing it with an evergreen or a low winter groundcover keeps a front-yard bed from looking empty in the off season.

Spring

Spring is when this plant wakes up from winter and pushes out new growth as the Hot Springs area warms past its last frost.

• Wait until after the average last spring frost for the Hot Springs area, around April 3, before planting new starts outside.
• New shoots return from the base as the soil warms, usually visible by mid-spring.
• Check around the base for volunteer seedlings from last year's seed drop, and thin the extras while they are small if you want to keep the patch contained.

Summer

Summer is the main bloom season here, and the plant handles the Hot Springs area's heat and humidity well once it is established.

• Clusters of yellow flowers open in June and keep going into September, drawing bees regularly during the hottest stretch.
• Once established, it tolerates short dry spells and prefers being on the drier side, so water only if the ground stays dry for many days in a row.
• After a heavy summer downpour, check that the bed drains well so roots do not sit in standing water, especially in clay soil.

Deadheading spent flower clusters through summer keeps the patch looking tended for a front yard and can help limit self-seeding into nearby beds.