Extending Your Growing Season with Nonwoven Covers
Created on 08.14
In most temperate regions, the growing season is defined by two dates: the last frost of spring and the first frost of autumn. Between them sits the entire profit window of a farm. Nonwoven covers push both ends of that window outward — often by two to four weeks on each side. In seasonal produce, those extra weeks are where the premium prices live.
The two ends of the season
Most growers think of season extension as one thing: starting earlier in spring. But there are two ends, and both pay.
The spring end. Soil warms later than air. Seedlings and transplants sit in cold ground, growing slowly, while the market pays premium prices for the first harvests of the year. A nonwoven cover lifts temperatures by 3–6°C and lets you plant two to four weeks earlier — or protect plants that are already in the ground from the last spring frosts.
The autumn end. The first frost of autumn ends the harvest for tender crops — often weeks before the market has finished paying strong prices. Covers keep late crops alive through early frosts, stretching harvest into the shoulder season when supply drops and prices firm up.
How the fabric does it
A nonwoven cover does three things at once:
- Traps heat.
- Lets light through.
- Breaks the wind.
The result: plants that start earlier, grow faster through cool spells, and keep producing later into the season — without a greenhouse structure or heating bill.
Match the cover to the season
Season-extension goal | Recommended GSM | What it does |
Early spring planting (down to -2°C) | 30–40 | Traps heat, 85%+ light, protects light frosts |
Standard spring / autumn extension | 50–60 | Balanced heat retention, handles windier weeks |
Late-autumn protection, cold sites | 70–100 | Maximum insulation for the shoulder season |
Frost-sensitive blossoms (orchard, berry) | 50–70, edges sealed | Protects the crop that carries the season's value |
Five rules that decide how much you gain
- Lay covers before the cold arrives, not after — the soil needs a full day of sun to build the heat the fabric will hold overnight.
- Leave slack, never stretch — the air gap is the insulation; a taut cover is a weak cover.
- Pin every edge, every 1–2 m — use fixing pins; a lifted corner is a heat leak and a weed entry.
- Ventilate on warm days — when temperatures rise above ~15°C, open the ends or lift the cover to prevent heat stress.
- Choose water-permeable nonwoven — rain and irrigation must still reach the soil; breathable fabric also prevents condensation disease under the cover.
The economics in one line
In seasonal markets, early and late harvests routinely sell 30–50% above mid-season prices. A two-week head start on one crop — or a two-week extension on another — typically covers the entire season's cover cost, several times over.
SEIATO AGRI supplies nonwoven row covers in 20–100 GSM, in standard and custom widths up to 3 m, with matching fixing pins. Tell us your crop, region and season — we'll recommend the GSM and width.
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