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.
159 Products
Sort By:
Sort By:
Truchas
Organic Pelleted Lettuce Seed
Compact, filled-out mini heads that are dark red even in the North.
Cook Salanova® –Hydroponic Green Oakleaf
Pelleted Lettuce Seed
Attractive leaf shape on compact heads.
Xem Salanova® – Hydroponic Red Oakleaf
Pelleted Lettuce Seed
Uniform, upright leaves and good weight.
New Red Fire
Organic Lettuce Seed
Uniform red leaf with heat tolerance and heavy heads of frilly leaves.
Breen
Organic Pelleted Lettuce Seed
Early producer of truly compact mini heads with bronze-red color.