How to Grow Timothy Grass
Wikimedia Commons
Timothy Grass
Phleum pratense
grassTimothy grass is a perennial cool-season bunchgrass widely cultivated for hay and pasture production. It features tall, slender stems with distinctive dense, cylindrical seed heads and is a staple forage crop in temperate regions. Known for its high nutritional value and palatability to livestock, timothy grass establishes quickly and tolerates cool, moist climates well.
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Example Timothy Grass timeline · Pittsburgh, PA (Zone 6b)
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Plant Timothy Grass
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Timothy Grass
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Timothy Grass dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-7, with best production in cool-season regions (zones 3-6)
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Germination & Seedling
2-4 weeksFine, thin shoots emerge 5-10 days after planting under moist conditions. Seedlings develop the characteristic narrow leaves in a tight bunchgrass pattern.
Keep soil consistently moist during germination. Avoid heavy traffic or grazing. Maintain weed-free conditions with light cultivation if needed.
Vegetative Growth
4-8 weeksPlant develops multiple tillers (shoots) from the crown, creating a dense clump. Leaves are long, narrow, and blue-green; height reaches 12-24 inches.
Apply nitrogen fertilizer in spring (30-50 lbs/acre) to encourage tiller formation. Control weeds. Light grazing or mowing promotes branching. Adequate moisture supports vigorous growth.
Stem Elongation & Boot Stage
3-5 weeksStems elongate rapidly; the developing seed head emerges from the leaf sheath (boot stage). Plant height increases to 24-36+ inches with visible inflorescence within the upper leaf sheath.
Reduce nitrogen fertilizer to prevent lodging. Monitor moisture—consistent supply prevents stress. For hay crops, this is when quality begins to decline as fiber content increases.
Flowering & Seed Head Emergence
2-3 weeksDistinctive dense, cylindrical, spike-like panicles (seed heads) fully emerge, typically 2-4 inches long with a purple or yellow-brown tint. Plant reaches maximum height.
For hay production, harvest at early boot to early head stage for best forage quality. If allowing seed production, ensure pollination conditions are favorable (moderate temperatures, adequate moisture).
Seed Maturation & Ripeness
3-4 weeksSeed heads dry and mature; seeds darken to brown. Stems lignify (harden); the plant reaches full maturity with reduced nutritional value.
For hay: harvest immediately if not already done—quality declines significantly. For seed production: allow complete maturation; heads may shatter naturally. Protect from rain once mature if harvesting seed.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Monitor for larvae in spring; use insecticidal sprays if populations exceed economic threshold; encourage natural predators
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Less common in timothy; control with miticides if severe; promote vigorous plant growth through proper fertility
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Remove infested plant material; may require insecticidal treatment in severe cases
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Avoid over-application of nitrogen; harvest before full seed maturity if ergot appears; use disease-resistant seed sources
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Ensure good air circulation; avoid excess nitrogen; resistant varieties available; remove heavily infected plants
Uses
Livestock Forage
CulinaryTimothy hay is a premium forage for horses, cattle, sheep, and other livestock. It provides balanced nutrition, palatability, and is often the gold standard for equine diets due to its low protein and calcium content. [source]
Pet Nutrition
CulinaryTimothy hay is widely used in rabbit, guinea pig, and other small pet diets. It supports healthy digestion and dental wear due to its fiber content and texture. [source]
Pasture & Forage Production
HouseholdTimothy grass is a foundational pasture species for grazing livestock. It establishes quickly, tolerates grazing, and provides reliable forage production in cool climates. [source]
Seed Production
CraftTimothy grass is grown commercially for seed production. Seed is used to reseed pastures, establish new forage stands, and restore native grasslands. [source]
Wildlife Habitat
WildlifeTimothy grass provides cover and food sources for grassland birds, pollinators, and small mammals. It supports diverse ecological functions in managed and conservation grasslands. [source]
Harvest Tips
For hay: Harvest at the boot to early-head stage (when seed heads just emerging) for optimal forage quality and nutritional value. Cut when stems are still somewhat tender but inflorescences are visible. For seed: Allow seed heads to fully mature and dry on plant (typically late summer); heads may be harvested by swathing and combining, or seeds allowed to shatter naturally. Timing: First cutting typically occurs 5-7 weeks after spring greenup; regrowth can produce second or third cuttings in the same season.
Fun Facts
- 🌱 Timothy grass is named after Timothy Hanson, a colonial farmer who promoted the grass in the 1700s, though the plant was already in use. It became known as 'Timothy' seed throughout North America.
- 🌱 The distinctive dense, cylindrical seed heads can produce up to 1,500 seeds per head, making timothy grass an efficient reproducer and valuable seed crop.
- 🌱 Timothy grass is highly nutritious for horses at the boot to early-head stage but loses quality quickly; hay cut at the wrong time can be less palatable and nutritious, making harvest timing critical for forage quality.
Gardening Terms
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