Heat Tolerant
Varieties labeled as “heat tolerant” will perform relatively well (compared to other varieties within their crop group) when exposed to hot weather. The Johnny’s Research Team assigns the Heat Tolerant symbol to individual varieties within crop groups that traditionally do not perform well in the heat (as opposed to warm season crops that thrive in the heat); we do this to guide growers to more suitable options. In addition to trialing heat-tolerant versions of cool-weather crops such as broccoli, cauliflower, and lettuce, we also seek out highly heat-tolerant versions of warm weather crops; for example, tomatoes that demonstrate the ability to set fruit even under heat stress. See individual product copy descriptions for variety-specific information.
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New Red Fire
Organic Lettuce Seed
Uniform red leaf with heat tolerance and heavy heads of frilly leaves.
Starfighter
Pelleted Lettuce Seed
Uniform, disease-resistant green leaf with excellent heat tolerance.
Red Malabar Spinach
Specialty Green Seed
Heat loving salad and stir-fry green with mild Swiss chard flavor.
Salanova® Green Oakleaf
Pelleted Lettuce Seed
Condensed saladbowl-type oakleaf for whole heads or salad mixes.
Truchas
Organic Pelleted Lettuce Seed
Compact, filled-out mini heads that are dark red even in the North.
Breen
Organic Pelleted Lettuce Seed
Early producer of truly compact mini heads with bronze-red color.
