Growli
Let's go

Plant care

Illinois Tick Trefoil (Illinois tick clover) care

Desmodium illinoense

Also called Illinois tick trefoil, Illinois tick clover, Prairie tick trefoil.

RHS H6USDA 4-8Pet-safeIndoor 60–120 cm (24–48 in) tall and 45–75 cm (18–30 in) wide.

Watering rhythm

10-14days

Deep watering every 10–14 days during the first growing season; drought-tolerant once established

Jump to schedule→Get smart reminders in the app

Light

Direct sun (at least 4-6 hours)

Soil

Sandy loam, loam, or clay-loam; dry to medium moisture; pH 5.5–7.5

Humidity

Low to moderate (30–60% RH)

Temp

-30°C to 40°C

Pet safety

Pet-safe

Mature size

60–120 cm (24–48 in) tall and 45–75 cm (18–30 in) wide.

Care at a glance

Light

Illinois Tick Trefoil needs sun on the leaves, not just bright ambient room light. Full sun is strongly preferred — a minimum of 6 hours daily; this is a prairie-interior species not well-adapted to even partial shade, which causes lax growth and greatly reduced flowering. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water illinois tick trefoil deep watering every 10–14 days during the first growing season; drought-tolerant once established. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. More drought-tolerant than the closely related D. canadense; thrives in the dry to mesic conditions of inland prairie remnants. Avoid waterlogged soils, which promote root disease.

Soil and pot

Illinois Tick Trefoil grows best in sandy loam, loam, or clay-loam; dry to medium moisture; ph 5.5–7.5. Adapted to the range of native prairie soils from sandy to moderately heavy textures; fixes nitrogen and does not benefit from fertile amended soil — lean native soils are ideal. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Illinois Tick Trefoil sits happiest at around Low to moderate (30–60% RH) humidity and -30°C to 40°C (-22°F to 104°F). Adapted to the moderate humidity of the Midwest prairie belt; no special humidity requirements for outdoor cultivation. If you keep the room above year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed illinois tick trefoil sparingly. No fertiliser required; as a nitrogen-fixing legume it thrives without supplemental feeding and added nitrogen favours rank vegetative growth over flowering. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on illinois tick trefoil in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Sticky loment seed pods in pet fur — The multi-segmented seed pods are covered in hooked hairs that cling tenaciously to animal fur and human clothing; check pets after walks through areas where the plant grows and remove pods promptly to prevent matting.
  • Slow establishment and transplant stress — Like most prairie forbs with taproots, D. illinoense establishes slowly and resents transplanting once the root system is mature; plant in its permanent position while still small and do not disturb thereafter.

Propagation

Seed is the standard method — mechanically scarify the seed coat with sandpaper, then cold-stratify for 60 days, and sow in early spring; direct outdoor sowing in autumn allows natural cold stratification over winter. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Illinois Tick Trefoil is pet-safe. Desmodium illinoense is not listed by the ASPCA as toxic to cats or dogs; like other Desmodium species the sticky barbed seed pods (loments) can adhere to pet fur, causing matting and localised skin irritation if not removed. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Illinois Tick Trefoil care — frequently asked questions

What is the common name for Desmodium illinoense?

Desmodium illinoense is most commonly called Illinois Tick Trefoil, but it is also known as Illinois tick trefoil, Illinois tick clover, Prairie tick trefoil. The names refer to the same species, so care instructions for Illinois Tick Trefoil apply identically to anything sold as Illinois tick clover.

How much light does illinois tick trefoil need?

Illinois Tick Trefoil grows best in direct sun (at least 4-6 hours). Full sun is strongly preferred — a minimum of 6 hours daily; this is a prairie-interior species not well-adapted to even partial shade, which causes lax growth and greatly reduced flowering.

How often should I water illinois tick trefoil?

Water illinois tick trefoil deep watering every 10–14 days during the first growing season; drought-tolerant once established. More drought-tolerant than the closely related D. canadense; thrives in the dry to mesic conditions of inland prairie remnants. Avoid waterlogged soils, which promote root disease. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is illinois tick trefoil toxic to cats and dogs?

Illinois Tick Trefoil is pet-safe. Desmodium illinoense is not listed by the ASPCA as toxic to cats or dogs; like other Desmodium species the sticky barbed seed pods (loments) can adhere to pet fur, causing matting and localised skin irritation if not removed.

What USDA hardiness zone does illinois tick trefoil grow in?

Illinois Tick Trefoil is rated for USDA zone 4-8 and RHS hardiness H6. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Illinois Tick Trefoil deep-dive guides

Every aspect of illinois tick trefoil care, each with its own calibrated guide:

Featured in these plant shortlists

Illinois Tick Trefoil qualifies for 9 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Illinois Tick Trefoil is also known as Illinois tick trefoil, Illinois tick clover, and Prairie tick trefoil.