Heat Tolerant Varieties | Johnny's Selected Seeds

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146 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

146 Products

New

Purple Fusion Summer Crisp Lettuce (Batavia)

Purple Fusion

Lettuce Seed

Summer performance with color.

New

Yago Bunching Onions

Yago

(F1) Onion Seed

Our recommended replacement for Nabechan.

New

Purple Fusion Summer Crisp Lettuce (Batavia)

Purple Fusion

Pelleted Lettuce Seed

Summer performance with color.

New

Reno Summer Crisp Lettuce (Batavia)

Reno

Lettuce Seed

Exceptional heat tolerance.

New

Gatsbi Bibb Lettuce

Gatsbi

Pelleted Lettuce Seed

High-performance gem type.

New

Fujiyama Standard Cauliflower

Fujiyama

(F1) Cauliflower Seed

Superior heat tolerance.

New

Gatsbi Bibb Lettuce

Gatsbi

Lettuce Seed

High-performance gem type.

New

Tessaury Standard Cauliflower

Tessaury

Organic (F1) Cauliflower Seed

Heat tolerant organic cauliflower.

New

Reno Summer Crisp Lettuce (Batavia)

Reno

Pelleted Lettuce Seed

Exceptional heat tolerance.

Salanova® Green Butter Salanova® Lettuce

Salanova® Green Butter

Pelleted Lettuce Seed

Dense rosette heads with buttery flavor and attractive, supple leaves.

Sora Round Radishes

Sora

Organic Radish Seed

Heat-tolerant organic variety that produces high-quality roots.

Rover Round Radishes

Rover

(F1) Radish Seed

Extra-early and refined.

Muir Summer Crisp Lettuce (Batavia)

Muir

Organic Pelleted Lettuce Seed

The most heat tolerant lettuce.

Salanova® Premier Collection Salanova® Lettuce

Salanova® Premier Collection

Pelleted Lettuce Seed

Refine your salad mix with color, flavor, and elegance.

Truchas Romaine Lettuce (Cos)

Truchas

Organic Lettuce Seed

Compact, filled-out mini heads that are dark red even in the North.

Breen Romaine Lettuce (Cos)

Breen

Organic Lettuce Seed

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

Salanova® Red Butter Salanova® Lettuce

Salanova® Red Butter

Pelleted Lettuce Seed

Dense rosette heads with buttery flavor and attractive, supple leaves.

Astro Arugula (Roquette)

Astro

Salad Arugula Seed

Early, heat-tolerant standard variety.

Sunland Romaine Lettuce (Cos)

Sunland

Pelleted Lettuce Seed

Heat-tolerant romaine for heads and hearts.

Chalupa Romaine Lettuce (Cos)

Chalupa

Organic Lettuce Seed

Unique, sweet romaine with excellent bolt tolerance.

Salanova® Red Oakleaf Salanova® Lettuce

Salanova® Red Oakleaf

Pelleted Lettuce Seed

Condensed saladbowl-type oakleaf for whole heads or salad mixes.

Salanova® Green Sweet Crisp Salanova® Lettuce

Salanova® Green Sweet Crisp

Pelleted Lettuce Seed

Romaine-like sweet flavor with iceberg-like crisp, crunchy texture.

Chalupa Romaine Lettuce (Cos)

Chalupa

Organic Pelleted Lettuce Seed

Unique, sweet romaine with excellent bolt tolerance.

Romance Main Crop Carrots

Romance

Pelleted (F1) Carrot Seed

Impressive flavor for a summer-harvested carrot.

Romance Main Crop Carrots

Romance

(F1) Carrot Seed

Impressive flavor for a summer-harvested carrot.

Salanova® Green Oakleaf Salanova® Lettuce

Salanova® Green Oakleaf

Pelleted Lettuce Seed

Condensed saladbowl-type oakleaf for whole heads or salad mixes.

Muir Summer Crisp Lettuce (Batavia)

Muir

Organic Lettuce Seed

Our most heat tolerant lettuce.

Salanova® Green Batavia Salanova® Lettuce

Salanova® Green Batavia

Pelleted Lettuce Seed

Tasty, versatile Batavia leaf type.

Katrina Seedless and Thin-skinned Cucumbers

Katrina

Organic (F1) Cucumber Seed

Tasty snacking cucumber with good heat tolerance.

Green Magic Standard Broccoli

Green Magic

(F1) Broccoli Seed

Excellent heat tolerance and smooth, well-domed, very attractive heads.

Astro Arugula (Roquette)

Astro

Organic Salad Arugula Seed

Early, heat-tolerant standard variety.

Black Summer Pac Choi (Bok Choy)

Black Summer

(F1) Green Seed

Beautiful dark green pac choi, best at full size, suitable for minis.

Adriana Butterhead Lettuce (Boston)

Adriana

Pelleted Lettuce Seed

Heat tolerant dark green butterhead with broad disease resistance.

Happy Rich Mini Broccoli

Happy Rich

(F1) Broccoli Seed

Vigorous mini broccoli for successful summer crops and sweeter flavor.

White Spear Bunching Onions

White Spear

Onion Seed

Large, heat-resistant bunching onions.

Red Cross Butterhead Lettuce (Boston)

Red Cross

Organic Pelleted Lettuce Seed

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

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Pelleted Lettuce Seed

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

Sunland Romaine Lettuce (Cos)

Sunland

Lettuce Seed

Heat-tolerant romaine for heads and hearts.

Salanova® Red Gem Salanova® Lettuce

Salanova® Red Gem

Pelleted Lettuce Seed

Gorgeous Little Gem-type Salanova.

Asian Delight Pac Choi (Bok Choy)

AAS (All-America Selections) Winners

Asian Delight

(F1) Green Seed

Slow-bolting white-stem pac choi for dense, fully formed mini heads.

Cherokee Summer Crisp Lettuce (Batavia)

Cherokee

Pelleted Lettuce Seed

Darkest red leaves with long harvest window and good flavor.

Rosaine Bibb Lettuce

Rosaine

Lettuce Seed

Dark red Little Gem-type for mini heads.

Crunchy King Round Radishes

Crunchy King

(F1) Radish Seed

Even maturity and a long harvest window.

Salanova® Hydroponic Red Sweet Crisp Salanova® Lettuce

Salanova® Hydroponic Red Sweet Crisp

Pelleted Lettuce Seed

Slow bolting and great shelf-life.

Salanova® Hydroponic Green Butter Salanova® Lettuce

Salanova® Hydroponic Green Butter

Pelleted Lettuce Seed

Fast-growing butter type.

Skyphos Butterhead Lettuce (Boston)

Skyphos

Pelleted Lettuce Seed

Most adaptable butterhead with excellent flavor and texture.

Salanova® Hydroponic Red Butter Salanova® Lettuce

Salanova® Hydroponic Red Butter

Pelleted Lettuce Seed

Vigorous, slow-bolting red butter type.

Salanova® Hydroponic Red Batavia Salanova® Lettuce

Salanova® Hydroponic Red Batavia

Pelleted Lettuce Seed

Unique leaf with intense color.

Intercut One-Cut Lettuce

Intercut

Pelleted Lettuce Seed

Our highest yielding one-cut.

Tropicana Lettuce

Tropicana

Pelleted Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Clementine Standard Cauliflower

Clementine

(F1) Cauliflower Seed

Vibrant orange.

Salanova® Hydroponic Green Sweet Crisp Salanova® Lettuce

Salanova® Hydroponic Green Sweet Crisp

Pelleted Lettuce Seed

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

Adriana Butterhead Lettuce (Boston)

Adriana

Lettuce Seed

Heat tolerant dark green butterhead with broad disease resistance.

Salanova® Hydroponic Red Oakleaf Salanova® Lettuce

Salanova® Hydroponic Red Oakleaf

Pelleted Lettuce Seed

Uniform, upright leaves and good weight.

Magenta Summer Crisp Lettuce (Batavia)

Magenta

Lettuce Seed

A red Summer Crisp with good flavor.

Magenta Summer Crisp Lettuce (Batavia)

Magenta

Pelleted Lettuce Seed

A red Summer Crisp with good flavor.

Panisse Oakleaf Lettuce

Panisse

Pelleted Lettuce Seed

Large, bright green oakleaf with dense heads and long harvest window.

Imperial Standard Broccoli

Imperial

(F1) Broccoli Seed

Excellent heat tolerance.

Truchas Romaine Lettuce (Cos)

Truchas

Organic Pelleted Lettuce Seed

Compact, filled-out mini heads that are dark red even in the North.

Gershwin Pickling Cucumbers

Gershwin

(F1) Cucumber Seed

Parthenocarpic field pickler.

Gladius Romaine Lettuce (Cos)

Gladius

Pelleted Lettuce Seed

High-performance romaine for hydroponics.

Starfighter Lettuce

Starfighter

Pelleted Lettuce Seed

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

Salanova® Hydroponic Green Oakleaf Salanova® Lettuce

Salanova® Hydroponic Green Oakleaf

Pelleted Lettuce Seed

Attractive leaf shape on compact heads.

Kolibri Bibb Lettuce

Kolibri

Organic Pelleted Lettuce Seed

Gorgeous speckled mini bibb.

Sparx Romaine Lettuce (Cos)

Sparx

Pelleted Lettuce Seed

Heat-tolerant romaine for long, uniform hearts with good flavor.

Katrina Cucumbers

Katrina

(F1) Cucumber Seed

Tasty snacking cucumber with good heat tolerance.

Salvius Romaine Lettuce (Cos)

Salvius

Pelleted Lettuce Seed

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