Fertilising guide
How to fertilise Showy Tick Trefoil (Desmodium canadense)— schedule & NPK
Also called Showy tick trefoil, Canada tick trefoil, Showy tick clover.
More about showy tick trefoil
About Showy Tick Trefoil
Desmodium canadense · also called Showy tick trefoil, Canada tick trefoil · flowering
Desmodium canadense is a tall, robust native perennial wildflower of moist prairies, thicket edges, and open woodland borders across eastern and central North America, from Nova Scotia to Saskatchewan and south to Oklahoma and North Carolina. It produces showy rose-pink to purple pea-like flowers in branched racemes in mid- to late summer, making it one of the most ornamentally valuable of the native tick trefoils for pollinator gardens. It tolerates a broader range of soil moisture than most prairie natives and self-seeds freely. It is not listed as toxic to cats or dogs by the ASPCA, though its seed pods attach to fur and clothing via hooked hairs.
Growth habit: Upright, branching clump-forming perennial with stout stems bearing trifoliate leaves and open branched racemes of pink-purple flowers in July–September.
Watch for — Stem flop in shade or rich soil: In shadier sites or nutrient-rich garden beds, stems may reach 2 m and flop without support; plant in full sun with lean soil and use pea sticks or neighbouring grasses to provide natural support.
What fertiliser showy tick trefoil actually wants — and why
Showy Tick Trefoil is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for showy tick trefoil: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed showy tick trefoil, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For showy tick trefoil:
No feeding required; as a nitrogen-fixing legume it meets its own nutritional needs in average to lean soils. Fertilising promotes excessive height and flopping. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when showy tick trefoil is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for showy tick trefoil
Half strength is the safe default for showy tick trefoil — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water showy tick trefoil first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the showy tick trefoil watering schedule.
Signs you are over-feeding showy tick trefoil
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for showy tick trefoil:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding showy tick trefoil
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full showy tick trefoil care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of showy tick trefoil with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for showy tick trefoil
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising showy tick trefoil — frequently asked questions
What fertiliser does showy tick trefoil need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Showy Tick Trefoil is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed showy tick trefoil?
No feeding required; as a nitrogen-fixing legume it meets its own nutritional needs in average to lean soils. Fertilising promotes excessive height and flopping. No feeding required; as a nitrogen-fixing legume it meets its own nutritional needs in average to lean soils. Fertilising promotes excessive height and flopping. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for showy tick trefoil?
Half strength is the safe default for showy tick trefoil — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding showy tick trefoil look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding showy tick trefoil year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of showy tick trefoil?
Flush the pot of showy tick trefoil with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Showy Tick Trefoil care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water showy tick trefoil — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise houseleek saxifrage
- How to fertilise balkan saxifrage
- How to fertilise diapensia-like saxifrage
- All 10153 fertilising guides in the Growli library