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

149 Products

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Salanova® Green Butter Salanova® Lettuce

Salanova® Green Butter

Pelleted Lettuce Seed

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

Rover Round Radishes

Rover

(F1) Radish Seed

Extra-early and refined.

Truchas Romaine Lettuce (Cos)

Truchas

Organic Lettuce Seed

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

Salanova® Red Butter Salanova® Lettuce

Salanova® Red Butter

Pelleted Lettuce Seed

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

Breen Romaine Lettuce (Cos)

Breen

Organic Lettuce Seed

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

Yago Bunching Onions

Yago

(F1) Onion Seed

Our recommended replacement for Nabechan.

Romance Main Crop Carrots

Romance

Pelleted (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.

Chalupa Romaine Lettuce (Cos)

Chalupa

Organic Lettuce Seed

Unique, sweet romaine with excellent bolt tolerance.

Astro Arugula (Roquette)

Astro

Organic 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.

Red Cross Butterhead Lettuce (Boston)

Red Cross

Organic Lettuce Seed

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

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.

Salanova® Green Sweet Crisp Salanova® Lettuce

Salanova® Green Sweet Crisp

Pelleted Lettuce Seed

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

White Spear Bunching Onions

White Spear

Onion Seed

Large, heat-resistant bunching onions.

Salanova® Red Oakleaf Salanova® Lettuce

Salanova® Red Oakleaf

Pelleted Lettuce Seed

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

Salanova® Premier Collection Salanova® Lettuce

Salanova® Premier Collection

Pelleted Lettuce Seed

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

Astro Arugula (Roquette)

Astro

Salad Arugula Seed

Early, heat-tolerant standard variety.

Romance Main Crop Carrots

Romance

(F1) Carrot Seed

Impressive flavor for a summer-harvested carrot.

Muir Summer Crisp Lettuce (Batavia)

Muir

Organic Lettuce Seed

Our most heat-tolerant lettuce.

Gershwin Pickling Cucumbers

Gershwin

(F1) Cucumber Seed

Parthenocarpic field pickler.

Chalupa Romaine Lettuce (Cos)

Chalupa

Organic Pelleted Lettuce Seed

Unique, sweet romaine with excellent bolt tolerance.

Sunland Romaine Lettuce (Cos)

Sunland

Lettuce Seed

Heat-tolerant romaine for heads and hearts.

Happy Rich Mini Broccoli

Happy Rich

(F1) Broccoli Seed

Vigorous mini broccoli for successful summer crops and sweeter flavor.

Donato Round Radishes

Donato

(F1) Radish Seed

Early, resistant, and reliable.

Salanova® Green Oakleaf Salanova® Lettuce

Salanova® Green Oakleaf

Pelleted Lettuce Seed

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

Red Malabar Spinach Specialty Greens

Red Malabar Spinach

Specialty Green Seed

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

Adriana Butterhead Lettuce (Boston)

Adriana

Pelleted Lettuce Seed

Heat tolerant dark green butterhead with broad disease resistance.

Purple Fusion Summer Crisp Lettuce (Batavia)

Purple Fusion

Pelleted Lettuce Seed

Summer performance with color.

Katrina Cucumbers

Katrina

(F1) Cucumber Seed

Tasty snacking cucumber with good heat tolerance.

Cherokee Summer Crisp Lettuce (Batavia)

Cherokee

Pelleted Lettuce Seed

Darkest red leaves with long harvest window and good flavor.

Salanova® Red Gem Salanova® Lettuce

Salanova® Red Gem

Pelleted Lettuce Seed

Gorgeous Little Gem-type Salanova.

Cherokee Summer Crisp Lettuce (Batavia)

Cherokee

Lettuce Seed

Darkest red leaves with long harvest window and good flavor.

Black Summer Pac Choi (Bok Choy)

Black Summer

(F1) Green Seed

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

Monty Standard Broccoli

Monty

(F1) Broccoli Seed

Superior heat tolerance.

Rosaine Bibb Lettuce

Rosaine

Lettuce Seed

Dark red Little Gem-type for mini heads.

Starfighter Lettuce

Starfighter

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.

Clementine Standard Cauliflower

Clementine

(F1) Cauliflower Seed

Vibrant orange.

Salanova® Hydroponic Red Batavia Salanova® Lettuce

Salanova® Hydroponic Red Batavia

Pelleted Lettuce Seed

Unique leaf with intense color.

Magenta Summer Crisp Lettuce (Batavia)

Magenta

Pelleted Lettuce Seed

A red Summer Crisp with good flavor.

Rhone One-Cut Lettuce

Rhone

Organic Pelleted Lettuce Seed

Organic one-cut with spiky bronze leaves and great yields.

Salanova® Red Tango Salanova® Lettuce

Salanova® Red Tango

Pelleted Lettuce Seed

Premier one-cut Tango type.

Imperial Standard Broccoli

Imperial

(F1) Broccoli Seed

Excellent heat tolerance.

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.

Kolibri Bibb Lettuce

Kolibri

Organic Lettuce Seed

Gorgeous speckled mini bibb.

Skyphos Butterhead Lettuce (Boston)

Skyphos

Pelleted Lettuce Seed

Most adaptable butterhead with excellent flavor and texture.

New Red Fire Leaf Lettuce

New Red Fire

Organic Lettuce Seed

Uniform red leaf with heat tolerance and heavy heads of frilly leaves.

Red Giant Mustard Greens

Red Giant

Organic Mustard Green Seed

Very slow-bolting broadleaf mustard.

Purple Fusion Summer Crisp Lettuce (Batavia)

Purple Fusion

Lettuce Seed

Summer performance with color.

Magenta Summer Crisp Lettuce (Batavia)

Magenta

Lettuce Seed

A red Summer Crisp with good flavor.

Rosaine Bibb Lettuce

Rosaine

Pelleted Lettuce Seed

Dark red Little Gem-type for mini heads.

Kolibri Bibb Lettuce

Kolibri

Organic Pelleted Lettuce Seed

Gorgeous speckled mini bibb.

Tropicana Lettuce

Tropicana

Pelleted Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Salanova® Hydroponic Red Butter Salanova® Lettuce

Salanova® Hydroponic Red Butter

Pelleted Lettuce Seed

Vigorous, slow-bolting red butter type.

Starfighter Lettuce

Starfighter

Pelleted Lettuce Seed

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

Salanova® Hydroponic Red Oakleaf Salanova® Lettuce

Salanova® Hydroponic Red Oakleaf

Pelleted Lettuce Seed

Uniform, upright leaves and good weight.

Sparx Romaine Lettuce (Cos)

Sparx

Pelleted Lettuce Seed

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

Truchas Romaine Lettuce (Cos)

Truchas

Organic Pelleted Lettuce Seed

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

Tessaury Standard Cauliflower

Tessaury

Organic (F1) Cauliflower Seed

Heat tolerant organic cauliflower.

Fusion Summer Crisp Lettuce (Batavia)

Fusion

Pelleted Lettuce Seed

Slow bolting and upright with great flavor.

Tropicana Lettuce

Tropicana

Organic Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Ruby Red Orach Specialty Greens

Ruby Red Orach

Organic Specialty Green Seed

Colorful heat-tolerant spinach alternative.

Intercut One-Cut Lettuce

Intercut

Pelleted Lettuce Seed

Our highest yielding one-cut.

Salanova® Hydroponic Green Oakleaf Salanova® Lettuce

Salanova® Hydroponic Green Oakleaf

Pelleted Lettuce Seed

Attractive leaf shape on compact heads.

Salvius Romaine Lettuce (Cos)

Salvius

Pelleted Lettuce Seed

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

Green 70 D Improved Asian Greens

Green 70 D Improved

Asian Green Seed

Heat-tolerant choi sum for "cut and come again" harvest.

Estiva Slicing Tomatoes

Estiva

(F1) Tomato Seed

Delicious slicer with impressive heat tolerance.

Sparx Romaine Lettuce (Cos)

Sparx

Lettuce Seed

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

Salanova® Green Batavia Salanova® Lettuce

Salanova® Green Batavia

Pelleted Lettuce Seed

Tasty, versatile Batavia leaf type.

Jolene Beefsteak Tomatoes

Jolene

(F1) Tomato Seed

Excels in the Southern U.S.