Cold hardiness & minimum temperature

Is Sessile-Leaf Tick Trefoil (Desmodium sessilifolium)cold hardy? Hardiness zone & min temp

Also called Sessile-leaf tick trefoil, Sessile tick clover, Stiff tick trefoil.

More about sessile-leaf tick trefoil

About Sessile-Leaf Tick Trefoil

Desmodium sessilifolium · also called Sessile-leaf tick trefoil, Sessile tick clover · flowering

Desmodium sessilifolium is a slender, erect native perennial forb of dry open woodlands, woodland edges, and rocky or sandy upland prairies across the eastern and central United States, from New England south to Florida and west to Kansas and Nebraska. Its common and species names reflect its unusual nearly sessile (stalkless) trifoliate leaves that clasp the upright stems. It is one of the more shade-tolerant Desmodium species, performing in open woodland settings that would stress other prairie legumes. Pink-purple flowers in July–August are followed by sticky segmented seed pods attractive to birds and supporting hairstreak butterfly larvae. It is not listed as toxic to cats or dogs by the ASPCA.

Cold limit: USDA 4-8 · RHS H6 (-25°C to 38°C)

What sessile-leaf tick trefoil's hardiness rating actually means

Yes — sessile-leaf tick trefoil is genuinely cold hardy. Rated RHS H6 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 4-8 — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly about −20 to −15 °C. Sessile-Leaf Tick Trefoil is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for sessile-leaf tick trefoil as it gets too cold:

It tolerates winter lows to about −20 to −15 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can sessile-leaf tick trefoil go outside or overwinter — and where?

Plant it out within USDA 4-8 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when sessile-leaf tick trefoil can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Sessile-Leaf Tick Trefoil hardiness — frequently asked questions

Is sessile-leaf tick trefoil cold hardy?

Yes — sessile-leaf tick trefoil is genuinely cold hardy. Rated RHS H6 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Sessile-Leaf Tick Trefoil is hardy across USDA 4-8; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature sessile-leaf tick trefoil can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Sessile-Leaf Tick Trefoil is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is sessile-leaf tick trefoil?

Sessile-Leaf Tick Trefoil is rated USDA 4-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can sessile-leaf tick trefoil survive winter outside?

Plant it out within USDA 4-8 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

What happens to sessile-leaf tick trefoil below its minimum temperature?

It tolerates winter lows to about −20 to −15 °C once established. Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root. First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.