Heat Tolerant Varieties | Johnny's Selected Seeds

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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

159 Products

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Azirka CrunchLeaf Lettuce

Azirka

Pelleted Lettuce Seed

Extra-crunchy complement to Cristabel.

Amadeus Standard Broccoli

Amadeus

(F1) Broccoli Seed

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

Paxton Standard Cauliflower

Paxton

(F1) Cauliflower Seed

Resistance to club root.

Kolibri Bibb Lettuce

Kolibri

Organic Pelleted Lettuce Seed

Gorgeous speckled mini bibb.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Pelleted Lettuce Seed

Crunchy rib with an iceberg look.

Volcana Bibb Lettuce

Volcana

Pelleted Lettuce Seed

Red-to-the-heart mini.

Breen Romaine Lettuce (Cos)

Breen

Lettuce Seed

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

Riptide Romaine Lettuce (Cos)

Riptide

Organic Lettuce Seed

Crunchy rib with an iceberg look.

Sale

Salvius Romaine Lettuce (Cos)

Salvius

Lettuce Seed

Bolt tolerant, widely adaptable with open habit suited for heads.

Sale

Starfighter Lettuce

Starfighter

Lettuce Seed

Uniform, disease-resistant green leaf with excellent heat tolerance.

Sale

Carlton Asian Greens

Carlton

(F1) Asian Green Seed

Very dark green komatsuna with good heat and cold tolerance.

Sale

Twister Standard Cauliflower

Twister

(F1) Cauliflower Seed

Superior wrap and adaptability.

Sale

Rubygo One-Cut Lettuce

Rubygo

Pelleted Lettuce Seed

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

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Pelleted Lettuce Seed

Dark green, compact romaine for an all-season mid-size.

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Lettuce Seed

Dark green, compact romaine for an all-season mid-size.

Picolino Seedless and Thin-skinned Cucumbers

Picolino

Organic (F1) Cucumber Seed

High-quality organic snacking cucumber.

Red Cloud Asian Greens

Red Cloud

(F1) Asian Green Seed

Rich burgundy hybrid tatsoi for bunching or baby leaf.

Melody Mini Broccoli

Melody

(F1) Broccoli Seed

Our most tender, flavorful mini broccoli.

Out Of Stock

Green Wave Mustard Greens

AAS (All-America Selections) Winners

Green Wave

Organic Mustard Green Seed

Our spiciest green mustard.

Out Of Stock

Sale

Intercut One-Cut Lettuce

Intercut

Pelleted Lettuce Seed

Our highest yielding one-cut.

Out Of Stock