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

Sora Round Radishes

Sora

Organic Radish Seed

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

Salanova® Red Butter Salanova® Lettuce

Salanova® Red Butter

Pelleted Lettuce Seed

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

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.

Sunland Romaine Lettuce (Cos)

Sunland

Pelleted Lettuce Seed

Heat-tolerant romaine for heads and hearts.

Green Magic Standard Broccoli

Green Magic

(F1) Broccoli Seed

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

Romance Main Crop Carrots

Romance

Pelleted (F1) Carrot Seed

Impressive flavor for a summer-harvested carrot.

Crunchy King Round Radishes

Crunchy King

(F1) Radish Seed

Even maturity and a long harvest window.

Sunland Romaine Lettuce (Cos)

Sunland

Lettuce Seed

Heat-tolerant romaine for heads and hearts.

Chalupa Romaine Lettuce (Cos)

Chalupa

Organic Pelleted Lettuce Seed

Unique, sweet romaine with excellent bolt tolerance.

Romance Main Crop Carrots

Romance

(F1) Carrot Seed

Impressive flavor for a summer-harvested carrot.

Muir Summer Crisp Lettuce (Batavia)

Muir

Organic Pelleted Lettuce Seed

The most heat tolerant lettuce.

Gershwin Pickling Cucumbers

Gershwin

(F1) Cucumber Seed

Parthenocarpic field pickler.

Astro Arugula (Roquette)

Astro

Salad Arugula Seed

Early, heat-tolerant standard variety.

Katrina Seedless and Thin-skinned Cucumbers

Katrina

Organic (F1) Cucumber Seed

Tasty snacking cucumber with good heat tolerance.

Salanova® Red Oakleaf Salanova® Lettuce

Salanova® Red Oakleaf

Pelleted Lettuce Seed

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

Red Cross Butterhead Lettuce (Boston)

Red Cross

Organic Pelleted Lettuce Seed

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

Salanova® Green Oakleaf Salanova® Lettuce

Salanova® Green 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.

Salanova® Premier Collection Salanova® Lettuce

Salanova® Premier Collection

Pelleted Lettuce Seed

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

Astro Arugula (Roquette)

Astro

Organic Salad Arugula Seed

Early, heat-tolerant standard variety.

Muir Summer Crisp Lettuce (Batavia)

Muir

Organic Lettuce Seed

Our most heat tolerant lettuce.

Happy Rich Mini Broccoli

Happy Rich

(F1) Broccoli Seed

Vigorous mini broccoli for successful summer crops and sweeter flavor.

Salanova® Green Batavia Salanova® Lettuce

Salanova® Green Batavia

Pelleted Lettuce Seed

Tasty, versatile Batavia leaf type.

Rosaine Bibb Lettuce

Rosaine

Lettuce Seed

Dark red Little Gem-type for mini heads.

Fusion Summer Crisp Lettuce (Batavia)

Fusion

Pelleted Lettuce Seed

Slow bolting and upright with great flavor.

Starfighter Lettuce

Starfighter

Lettuce Seed

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

White Spear Bunching Onions

White Spear

Onion Seed

Large, heat-resistant bunching onions.

Salanova® Red Gem Salanova® Lettuce

Salanova® Red Gem

Pelleted Lettuce Seed

Gorgeous Little Gem-type Salanova.

Salanova® Hydroponic Green Butter Salanova® Lettuce

Salanova® Hydroponic Green Butter

Pelleted Lettuce Seed

Fast-growing butter type.

Adriana Butterhead Lettuce (Boston)

Adriana

Pelleted Lettuce Seed

Heat tolerant dark green butterhead with broad disease resistance.

Magenta Summer Crisp Lettuce (Batavia)

Magenta

Pelleted Lettuce Seed

A red Summer Crisp with good flavor.

Donato Round Radishes

Donato

(F1) Radish Seed

Early, resistant, and reliable.

Salanova® Hydroponic Red Batavia Salanova® Lettuce

Salanova® Hydroponic Red Batavia

Pelleted Lettuce Seed

Unique leaf with intense color.

Tendita Romaine Lettuce (Cos)

Tendita

Pelleted Lettuce Seed

Crunchy, snackable, stackable mini cosberg.

Clementine Standard Cauliflower

Clementine

(F1) Cauliflower Seed

Vibrant orange.

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.

Truchas Romaine Lettuce (Cos)

Truchas

Organic Pelleted Lettuce Seed

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

Salanova® Hydroponic Red Butter Salanova® Lettuce

Salanova® Hydroponic Red Butter

Pelleted Lettuce Seed

Vigorous, slow-bolting red butter type.

Monty Standard Broccoli

Monty

(F1) Broccoli Seed

Superior heat tolerance.

Imperial Standard Broccoli

Imperial

(F1) Broccoli Seed

Excellent heat tolerance.

Black Summer Pac Choi (Bok Choy)

Black Summer

(F1) Green Seed

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

Gypsy Standard Broccoli

Gypsy

(F1) Broccoli Seed

Big, healthy plants with strong root system in substandard fertility.

Cherokee Summer Crisp Lettuce (Batavia)

Cherokee

Pelleted Lettuce Seed

Darkest red leaves with long harvest window and good flavor.

Red Malabar Spinach Specialty Greens

Red Malabar Spinach

Specialty Green Seed

Heat loving salad and stir-fry green with mild Swiss chard flavor.

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Lettuce Seed

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

Starfighter Lettuce

Starfighter

Pelleted Lettuce Seed

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

Adriana Butterhead Lettuce (Boston)

Adriana

Lettuce Seed

Heat tolerant dark green butterhead with broad disease resistance.

Sparx Romaine Lettuce (Cos)

Sparx

Pelleted Lettuce Seed

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

Estiva Slicing Tomatoes

Estiva

(F1) Tomato Seed

Delicious slicer with impressive heat tolerance.

Kolibri Bibb Lettuce

Kolibri

Organic Lettuce Seed

Gorgeous speckled mini bibb.

Rosaine Bibb Lettuce

Rosaine

Pelleted Lettuce Seed

Dark red Little Gem-type for mini heads.

Red Giant Mustard Greens

Red Giant

Organic Mustard Green Seed

Very slow-bolting, broadleaf mustard.

Sparx Romaine Lettuce (Cos)

Sparx

Lettuce Seed

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

EarliSnow Standard Cauliflower

EarliSnow

(F1) Cauliflower Seed

First early.

Intercut One-Cut Lettuce

Intercut

Pelleted Lettuce Seed

Our highest yielding one-cut.

Bauer Oakleaf Lettuce

AAS (All-America Selections) Winners

Bauer

Organic Lettuce Seed

Award-winning dark green oakleaf for full-size heads.

Salanova® Hydroponic Green Oakleaf Salanova® Lettuce

Salanova® Hydroponic Green Oakleaf

Pelleted Lettuce Seed

Attractive leaf shape on compact heads.

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Pelleted Lettuce Seed

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

Miz America Mustard Greens

Miz America

(F1) Mustard Green Seed

Exceptionally dark red, deeply lobed leaves.

Cherokee Summer Crisp Lettuce (Batavia)

Cherokee

Lettuce Seed

Darkest red leaves with long harvest window and good flavor.

Magenta Summer Crisp Lettuce (Batavia)

Magenta

Lettuce Seed

A red Summer Crisp with good flavor.

Breen Romaine Lettuce (Cos)

Breen

Organic Pelleted Lettuce Seed

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

Tendita Romaine Lettuce (Cos)

Tendita

Lettuce Seed

Crunchy, snackable, stackable mini cosberg.

Breen Romaine Lettuce (Cos)

Breen

Lettuce Seed

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

Salanova® Red Tango Salanova® Lettuce

Salanova® Red Tango

Pelleted Lettuce Seed

Premier one-cut Tango type.

Salanova® Hydroponic Red Oakleaf Salanova® Lettuce

Salanova® Hydroponic Red Oakleaf

Pelleted Lettuce Seed

Uniform, upright leaves and good weight.