Heat Tolerant Varieties | Johnny's Selected Seeds

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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.

Selecting Varieties for Heat Tolerance

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Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Lettuce Seed

Versatile mini romaine with sweet flavor.

Salanova® Hydroponic Red Oakleaf Salanova® Lettuce

Salanova® Hydroponic Red Oakleaf

Pelleted Lettuce Seed

Uniform, upright leaves and good weight.

Gladius Romaine Lettuce (Cos)

Gladius

Pelleted Lettuce Seed

High-performance romaine for hydroponics.

Breen Romaine Lettuce (Cos)

Breen

Organic Pelleted Lettuce Seed

Early producer of truly compact mini heads with bronze-red color.

Southern Giant Curled Mustard Greens

Southern Giant Curled

Mustard Green Seed

Our recommended sub for Green Wave.

Breen Romaine Lettuce (Cos)

Breen

Lettuce Seed

Early producer of truly compact mini heads with bronze-red color.

Salanova® Hydroponic Red Sweet Crisp Salanova® Lettuce

Salanova® Hydroponic Red Sweet Crisp

Pelleted Lettuce Seed

Slow bolting and great shelf-life.

Salanova® Hydroponic Green Sweet Crisp Salanova® Lettuce

Salanova® Hydroponic Green Sweet Crisp

Pelleted Lettuce Seed

High-yielding, crispy green leaf with excellent shelf-life.

Rubygo One-Cut Lettuce

Rubygo

Pelleted Lettuce Seed

Slow-bolting, flavorful, one-cut red leaf lettuce.

Volcana Bibb Lettuce

Volcana

Lettuce Seed

Red-to-the-heart mini.

Lalique Summer Crisp Lettuce (Batavia)

Lalique

Pelleted Lettuce Seed

Crunchy sandwich-sized leaves with year-round performance.

Salanova® Hydroponic Green Oakleaf Salanova® Lettuce

Salanova® Hydroponic Green Oakleaf

Pelleted Lettuce Seed

Attractive leaf shape on compact heads.

Tropicana Lettuce

Tropicana

Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Casey Butterhead Lettuce (Boston)

Casey

Pelleted Lettuce Seed

Improved butterhead for CEA summer slot.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Pelleted Lettuce Seed

Crunchy rib with an iceberg look.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Lettuce Seed

Crunchy rib with an iceberg look.

Red Cross Butterhead Lettuce (Boston)

Red Cross

Organic Lettuce Seed

Large and fancy, heat-tolerant red butterhead for stunning display.

Sale

Carlton Asian Greens

Carlton

(F1) Asian Green Seed

Very dark green komatsuna with good heat and cold tolerance.