Colonial Bentgrass
LawnAgrostis capillaris, Browntop Bent, Highland Bent, New Zealand Browntop
Fine-textured cool-season grass widely used in UK, Ireland, New Zealand, and Pacific Northwest lawns. Mows very closely — produces a dense, velvety lawn at 1–2.5 cm cutting height (ideal for ornamental lawns and croquet lawns). Spreads by stolons and forms a dense sward over time. Tolerates acidic, wet, and poorly-draining soils better than ryegrass. High maintenance compared to fescues: requires frequent mowing (2x/week at ornamental height), regular scarifying to prevent thatch build-up, and preventive fungicide for fusarium patch in autumn/winter wet periods. Fertilise lightly — 3–4 times per year. Creeping bentgrass (Agrostis stolonifera) is the greens-quality cousin used on golf courses but requires even more intensive management. For residential use, colonial/browntop bent suits mild, moist climates where a fine ornamental lawn is the goal.
When to sow colonial bentgrass
Sow 6–8 weeks before your first autumn frost.
Dashed line: typical first autumn frost in zone 7 (Nov 1). Zone dates are averages; most of the UK is zone 8–9, central Europe 6–7 and the Baltics and Scandinavia 4–6. In the app, Tomatograph uses your garden's own frost dates.
How to establish and care for colonial bentgrass
- 1
Sow
Sow in early autumn. Bentgrass suits mild, moist climates and tolerates acidic, wet soil better than ryegrass.
- 2
Mow often and low
Mow at 1–2.5 cm, often twice a week, for a dense, velvety finish.
- 3
Scarify
It spreads by runners and builds thatch, so scarify regularly.
- 4
Feed lightly
Feed lightly 3–4 times a year, and watch for fusarium patch in wet autumn and winter weather.
Growing conditions
Light
Full sun
Water
Medium water
Temperature
-25–25 °C
Frost tolerance
Frost-hardy — tolerates frost
Ideal soil pH
5–7
How Tomatograph watches your colonial bentgrass
Tomatograph checks your local forecast every morning and only speaks up when one of these applies to your garden.
- 30 °C or more with under 5 mm of rain forecast over 3 daysDeep-watering reminder before the lawn goes into heat stress.
- 3 nights at 0 °C or below in the forecastDormancy notice: stop regular watering, mowing and feeding until spring green-up.
- 30–60 days before your first frostAutumn prep window: aerate, overseed bare patches and apply a slow-release feed.
- Over 20 mm of rain forecast over 3 daysTells you to skip irrigation until the ground dries out.
Colonial Bentgrass questions
- When should I sow colonial bentgrass?
- Sow 6–8 weeks before your first autumn frost.
Growing guide written by Tomatograph. Zone frost dates are averages from openplantdb (CC0 1.0).