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Telegraph Improved

Cucumis sativus 'Telegraph Improved'

A classic English greenhouse cucumber variety that produces exceptionally long, smooth fruits with crisp, mild flesh and virtually no seeds. Originally developed for Victorian greenhouses, this productive climber can reach impressive lengths of 20+ inches and offers the authentic taste of premium European cucumbers. Perfect for gardeners wanting to grow restaurant-quality cucumbers at home.

Harvest

65-75d

Days to harvest

📅

Sun

White-Tailed Deer

☀️

Zones

2–11

USDA hardiness

🗺️

Height

8-18 inches

📏

Planting Timeline

Zone:

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Start Indoors

Transplant

Direct Sow

Harvest

Start Indoors

Transplant

Direct Sow

Harvest

Showing dates for Telegraph Improved in USDA Zone 7

All Zone 7 cucumber →

Zone Map

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Telegraph Improved · Zones 2–11

What grows well in Zone 7? →

Growing Details

Difficulty

Moderate

Spacing36-48 inches

SoilRich, well-drained soil with high organic content

pH6.5-7.5

Water1.5-2 inches per week, consistent moisture

SeasonWarm season

FlavorMild, crisp, refreshing with minimal seeds

ColorDark green, smooth skin

Size18-24 inches long, 2-3 inches diameter

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
Zone 3	May – May	June – July	June – August	September – October
Zone 4	April – May	June – June	June – July	September – October
Zone 5	April – April	May – June	May – July	August – October
Zone 6	April – April	May – June	May – July	August – September
Zone 7	March – April	May – May	May – June	July – September
Zone 8	March – March	April – May	April – June	July – August
Zone 9	February – February	March – April	March – May	June – July
Zone 10	January – February	March – March	March – April	May – July

Complete Growing Guide

Light: White-Tailed Deer. Soil: High Organic Matter. Soil pH: Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Height: 0 ft. 8 in. - 1 ft. 6 in.. Spread: 3 ft. 0 in. - 8 ft. 0 in.. Spacing: 12 inches-3 feet. Growth rate: Rapid. Maintenance: Medium. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

The "vegetable" is botanically a fruit– it is a pepo, a berry with a hard rind. Long and cylindrical, starting out prickly when young and smoothing out to a bumpy surface as it matures. Length and girth can vary based on cultivar and culinary purpose but grow at least 3 in long. Some varieties are bred to be seedless.

Color: Green. Type: Berry. Length: > 3 inches. Width: 1-3 inches.

Garden value: Edible, Showy

Harvest time: Summer

Bloom time: Summer

Edibility: Fruits are commonly eaten raw or pickled. Fresh cucumbers last in the fridge for about a week.

Storage & Preservation

Store freshly harvested Telegraph Improved cucumbers in the refrigerator crisper drawer wrapped in perforated plastic bags or paper towels to maintain humidity while preventing moisture buildup. They'll maintain peak quality for 7-10 days when stored at 50-55°F—slightly warmer than most refrigerator settings.

For longer storage, these cucumbers excel in refrigerator pickles due to their crisp texture and mild flavor. Slice and layer with salt for 2 hours, rinse, then pack in vinegar brine for quick pickles that last 2-3 weeks refrigerated. Their low seed content makes them ideal for bread-and-butter style pickles.

Telegraph Improved also freezes well when grated or chopped for later use in cold soups, smoothies, or tzatziki. While the texture becomes soft, the mild flavor remains intact. Dehydrated cucumber chips make excellent healthy snacks, though their high water content requires longer drying times than most vegetables.

History & Origin

Origin: Himalaya to Northern Thailand

Advantages

+Disease resistance: Heat
+Attracts: Bees
+Edible: Fruits are commonly eaten raw or pickled. Fresh cucumbers last in the fridge for about a week.
+Fast-growing

Companion Plants

Plant Together

Basil

Repels aphids, whiteflies, and cucumber beetles while potentially improving cucumber flavor

Marigold

Deters cucumber beetles, aphids, and nematodes with natural pest-repelling compounds

Nasturtium

Acts as trap crop for cucumber beetles and aphids, drawing pests away from cucumbers

Radish

Repels cucumber beetles and squash bugs, breaks up soil for cucumber root development

Beans

Fixes nitrogen in soil for cucumber growth, provides natural trellis structure

Corn

Provides natural support structure and shade, creates beneficial microclimate

Dill

Attracts beneficial insects like parasitic wasps that control cucumber pests

Lettuce

Grows well in cucumber shade, efficient use of garden space without competition

Keep Apart

Aromatic Herbs

Strong-scented herbs like sage and rosemary can inhibit cucumber growth and flavor

Potato

Competes for nutrients and space, may increase disease susceptibility

Tomato

Both are heavy feeders competing for nutrients, increased risk of shared diseases

Nutrition Facts

Calories

10kcal(1%)

Protein

0.59g(1%)

Fiber

0.7g(3%)

Carbs

2.16g(1%)

Fat

0.16g(0%)

Vitamin C

3.2mg(4%)

Vitamin A

4mcg(0%)

Vitamin K

7.2mcg(6%)

Iron

0.22mg(1%)

Calcium

14mg(1%)

Potassium

136mg(3%)

Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #169225)

Pests & Disease Resistance

Resistance

Moderate resistance, benefits from greenhouse or protected growing

Common Pests

Aphids, whiteflies, spider mites, cucumber beetles

Diseases

Powdery mildew, downy mildew, cucumber mosaic virus

Frequently Asked Questions

How long does Telegraph Improved cucumber take to grow?▼

Telegraph Improved cucumbers take 65-75 days from seed to harvest. Starting seeds indoors 4-6 weeks before transplanting can effectively extend your growing season. In ideal greenhouse conditions, you may see first harvests closer to 60 days, while outdoor growing in marginal conditions may push harvest to 80+ days.

Can you grow Telegraph Improved cucumbers in containers?▼

Yes, Telegraph Improved grows well in large containers (20+ gallons) with sturdy trellis support. The container must have excellent drainage and you'll need to water more frequently than ground plantings. Use rich potting mix and feed regularly, as container plants deplete nutrients faster than garden-grown vines.

Is Telegraph Improved good for beginners?▼

Telegraph Improved rates as moderate difficulty due to its need for consistent conditions, regular feeding, and disease management. Beginners succeed better starting with easier varieties first, then advancing to Telegraph Improved once comfortable with cucumber basics like training, watering schedules, and pest identification.

What does Telegraph Improved cucumber taste like?▼

Telegraph Improved offers a classic mild, crisp European cucumber flavor with minimal bitterness and virtually no seeds. The flesh is refreshing and clean-tasting, similar to expensive English cucumbers found in grocery stores. The skin is tender enough to eat without peeling when harvested at proper size.

When should I plant Telegraph Improved cucumber seeds?▼

Start seeds indoors 4-6 weeks before your last spring frost date, or direct sow outdoors once soil reaches 65°F consistently. In most areas, this means starting indoors in March-April and transplanting in May, or direct sowing in late May through June depending on your growing zone.

Do Telegraph Improved cucumbers need a greenhouse?▼

While not strictly required, Telegraph Improved performs significantly better in greenhouse or protected conditions. Outdoor growing succeeds in warm, humid climates with consistent temperatures above 65°F. Cold frames, hoop tunnels, or south-facing walls can substitute for greenhouse conditions in marginal climates.