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key growing information
How to Grow Greenhouse Tomatoes from Seed
How to grow tomatoes in a greenhouse or high tunnel: raising transplants, spacing per leader, temperatures, trellising and pruning, pests and harvest.
By Hensley’s Seed Co.
Greenhouse Tomatoes - Key Growing Information
SCIENTIFIC NAME:
Solanum lycopersicum
CULTURE:
Tomatoes do very well in tunnels and greenhouses, where you have more control over fruit quality and can stretch the harvest at both ends of the season. Culture is much like field tomatoes, but transplants are usually started earlier, often need a little longer to develop (6–7 weeks), and may need extra light to stay sturdy.
DAYS TO MATURITY:
From transplanting.
TRANSPLANTING INDOORS:
Allow 4–6 sq. ft. per leader, depending on variety, climate, disease pressure and pruning style. Plant deep as you would in the field, unless plants are grafted; then keep the graft union above the soil. For 5–7 days after planting, hold day and night temperatures at 73–77°F (23–25°C) to push fast leaf and root growth. Once fruit sets, drop nights to 62–66°F (17–19°C) and watch the crop closely to keep it producing all season.
TRELLISING/PRUNING:
Train each plant to 1–2 leaders with side shoots removed, each on its own vertical string, clipping about 1" below every third leaf. Keep strings snug and reuse the lower clips, keeping at least 3–4 per string. A lower-and-lean system suits long seasons, a sturdy structure and enough labor. Removing leaves and thinning clusters helps control disease and keeps plants productive. On grafted plants, remove any roots growing from the scion and any suckers from the rootstock.
INSECT PESTS AND DISEASE:
Pests under cover differ somewhat from those in the field, but the same control strategies apply. Beneficial insects and grafting generally work better in tunnels and greenhouses than outdoors.
HARVEST/STORAGE:
As for field tomatoes, with the added option of harvesting whole trusses.
TRANSPLANTS:
About 950 transplants per 1,000 seeds.
SEEDS/OZ. (AVG.):
11,000–13,000.
PACKET:
15 seeds per packet, enough for about 20'.
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