Heat Tolerant Varieties | Johnny's Selected Seeds

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142 Products

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

142 Products

Casey Butterhead Lettuce (Boston)

Casey

Pelleted Lettuce Seed

Improved butterhead for CEA summer slot.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Lettuce Seed

Crunchy rib with an iceberg look.

Amadeus Standard Broccoli

Amadeus

(F1) Broccoli Seed

Early for spring sowings, yields medium-sized, fancy heads.

Tropicana Lettuce

Tropicana

Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Red Leaf Vegetable Amaranth Specialty Greens

Red Leaf Vegetable Amaranth

Specialty Green Seed

Known as "red callaloo" in the Caribbean, comparable to spinach in taste.

Rubygo One-Cut Lettuce

Rubygo

Pelleted Lettuce Seed

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

Twister Standard Cauliflower

Twister

(F1) Cauliflower Seed

Superior wrap and adaptability.

Ruby Red Orach Specialty Greens

Ruby Red Orach

Organic Specialty Green Seed

Colorful heat-tolerant spinach alternative.

Volcana Bibb Lettuce

Volcana

Lettuce Seed

Red-to-the-heart mini.

Golden Frills Mustard Greens

Golden Frills

Organic Mustard Green Seed

Spicy, bright green, intricately lobed leaves.

Ezpark One-Cut Lettuce

Ezpark

Organic Pelleted Lettuce Seed

Deeply incised organic one-cut.

Bella Verde Mini Broccoli

Bella Verde

(F1) Broccoli Seed

High yields and excellent flavor.

Sale

Carlton Asian Greens

Carlton

(F1) Asian Green Seed

Very dark green komatsuna with good heat and cold tolerance.

Sale

Breen Romaine Lettuce (Cos)

Breen

Lettuce Seed

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

Sale

Breen Romaine Lettuce (Cos)

Breen

Pelleted Lettuce Seed

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

Sale

Azirka CrunchLeaf Lettuce

Azirka

Pelleted Lettuce Seed

Extra-crunchy complement to Cristabel.

Sale

Cristabel CrunchLeaf Lettuce

Cristabel

Pelleted Lettuce Seed

Extra-crunchy complement to Azirka.

Breen Romaine Lettuce (Cos)

Breen

Organic Lettuce Seed

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

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