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Hybrid R · Spinach

Growing Spinach in a
Hybrid R Multi-Tunnel

Cold-tolerant winter performer ideal for off-season Hybrid R production. The Hybrid R delivers +60 to 80% annual output enabled by 12-month growing window with birdproof ventilation, wide-span oval-tube construction, and Geometet® bolt-grade corrosion resistance.

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Technical Specs

Hybrid R × Spinach, At a Glance

6.4 to 7.5 m

Ideal Width

45 to 65°F (7 to 18°C)

Temperature

60 to 75%

Humidity

25 to 40 days from seeding

Cycle Length

+60 to 80% annual output enabled by 12-month growing window

Yield Gain

90 km/h (56 mph)

Wind Rating

Geomet® · ASTMB117-11

Bolt Standard

+30% vs. standard

Steel Strength

Structural Fit

Why the Hybrid R is the Right Structure for Spinach

Spinach is one of the few crops that grows actively below 50°F, making it a natural winter fill crop for Hybrid R structures that would otherwise sit idle from October through February in northern states. The structure provides just enough frost protection, keeping temperatures 10 to 15°F above ambient, to maintain continuous growth at minimum heating cost, since spinach needs only 40 to 45°F for sustained vegetative growth. The Hybrid R also protects spinach from the heavy rain and snow load that causes crown rot in outdoor winter plantings.

Yield Gain

+60 to 80% annual output enabled by 12-month growing window

vs. open-field production

Ideal Width

6.4 to 7.5 m

bay width for Spinach

Cycle

25 to 40 days from seeding

production cycle

FAQ

Spinach in a Hybrid R, Common Questions

Is spinach a good winter crop for a Hybrid R greenhouse?
Spinach is arguably the ideal winter fill crop for a Hybrid R. It tolerates light frost (down to 28°F/-2°C on mature leaves), grows actively at temperatures where most crops stop, and sells at premium prices during winter when outdoor supply collapses. A Hybrid R spinach planting in October can be harvesting by late November and continuing through March in most of the continental United States, the highest-price window for fresh local spinach.
What spinach varieties grow best in a greenhouse tunnel during winter?
Slow-bolting, cold-tolerant varieties are essential for winter tunnel production. Bloomsdale Longstanding is the classic open-pollinated winter variety. Among F1 hybrids, Corvair, Escalade, and Space have the best combination of cold tolerance, yield, and slow bolting. Savoy-type varieties like Tyee develop improved flavor after a light frost, a characteristic growers market as "frost-kissed spinach" at premium retail prices.
How much heat does a Hybrid R need to grow spinach through winter?
In USDA zones 6 to 8, a Hybrid R with double-layer poly and perimeter insulation can maintain 40 to 45°F nights with minimal supplemental heating, propane or electric unit heaters sized at 30 to 40 BTU per square foot of floor area are typically sufficient. In zones 4 to 5, more aggressive heating is needed from December through February, but spinach's low temperature set point still makes it 50 to 60% cheaper to heat for than a tomato or cucumber crop targeting 65°F nights.
Can I use a Hybrid R for year-round spinach production?
Yes, but summer management requires attention. Spinach bolts quickly when temperatures exceed 75°F and day length exceeds 14 hours. For summer production, choose ultra-slow-bolting varieties like Tyee or Reflect and use the Hybrid R's rollup side vents fully open with shade cloth at 30% density over the poly to reduce internal temperatures. Most commercial operators rotate spinach as a winter-spring-fall crop and fill summer with lettuce or basil, which are better heat performers.

Explore More

← Hybrid R Overview

Full specs, features & configurations

MG Model Greenhouse

9.6 m wide · Full enclosed · 108 km/h

Macrotunnel

Most affordable · No concrete needed

Ready to Grow Spinach in a Hybrid R?

Our team will design the right Hybrid R configuration for your Spinach operation, crop rows, bay width, ventilation, and optional gutters. Nationwide service.

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