Can You Still Plant Potatoes in June? Expert Guide to Late-Season Potato Planting

Introduction
Potatoes are one of the most rewarding and versatile crops you can grow, from tender new potatoes to hearty maincrop tubers for storage. While traditional planting windows span early spring (March–May), keen gardeners often ask: Can you still plant potatoes in June? The short answer is yes—if you select the right varieties, prepare your soil properly, and follow late-season potato planting best practices, you can secure a fresh supply of homegrown potatoes well into autumn. This guide will walk you through why June planting works, variety selection, soil and bed preparation, planting techniques, care and maintenance, pest and disease management, and harvest and storage, plus a Top 10 Q&A to address your burning questions.

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Why June Potato Planting Works

• Extended Growing Window: Many second early and early maincrop varieties mature in 70–90 days, fitting neatly into a June–September timeline.
• Avoiding Early-Season Pests: Planting in June lets you sidestep spring’s peak slug, vole, and blight pressure.
• Succession Harvests: Staggering sowing dates ensures a continuous supply—early potatoes in summer, June plantings in autumn.
• Warmer Soil Temperatures: By June, soil is reliably above 10 °C, promoting rapid shoot development and tuber set.

Embracing June as a late potato planting month can extend your harvest season and maximize bed utilisation.

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Choosing the Best Varieties for June Planting

Not all potatoes thrive when planted late. Opt for fast-maturing, disease-resistant cultivars:

1. Second Earlies
   • ‘Charlotte’: Creamy, waxy new potatoes ready in 75–90 days; excellent flavour retention.
   • ‘Rocket’: Fast-cooking tubers, harvestable in as little as 70 days.
2. Early Maincrops
   • ‘Swift’: High yields in around 70 days; bred for consistent performance.
   • ‘Maris Peer’: Reliable second early with good disease resistance.
3. Specialty and Salad Types
   • ‘Pink Fir Apple’: Unique flavour profile; matures in about 90 days.
   • ‘Red Duke of York’: Pink-skinned, waxy texture; harvest from 80 days.

Selecting a mix of second earlies and quick maincrops guarantees new potatoes mid-late summer and tubers for autumn storage.

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Soil and Bed Preparation for June Planting

Test and Adjust Soil pH

• Ideal Range: pH 5.5–6.5 for nutrient availability and disease suppression.
• Adjustment: Apply garden lime to raise pH or sulfur to lower it, based on a home pH test kit.

Enrich with Organic Matter

• Manure & Compost: Incorporate a 3–5 cm layer of well-rotted compost or farmyard manure to boost fertility and water retention.
• Mineral Feed: Work in a balanced organic granular feed (e.g., fish, blood & bone) for steady nutrient release.

Bed Structuring

• Double Digging: Loosen soil to 30 cm depth to encourage tuber bulking and improve drainage.
• Debris Removal: Clear stones and old roots that cause misshapen tubers.

Crop Rotation Principles

• Rotation: Avoid planting potatoes—or their Solanaceae relatives, such as tomatoes—in the same bed more than once every four years.
• Preceding Crops: Follow legumes or brassicas to help break pest and disease cycles.

Well-prepared soil is the foundation for successful late potato crops.

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Planting Techniques for Late-Season Potatoes

Chitting vs. Direct Planting

• Chitting: Pre-sprout seed potatoes on a light, cool windowsill for 2–4 weeks before planting to accelerate emergence.
• Direct Planting: If time is tight, plant chitted or unchitted tubers directly—expect emergence in 10–14 days once soil warms.

Trench Method

1. Dig Trenches: 10 cm deep, spaced 60 cm apart.
2. Lay Tubers: Position seed potatoes 30 cm apart, eyes upward.
3. Cover Lightly: Fill trench with 5 cm of soil; as shoots appear, earth up to form ridges.

Mounding/Ridge Method

• Surface Planting: Place tubers on ground level, cover with 5–10 cm soil or compost, then mound into ridges as growth occurs.
• Advantages: Warmer soil, improved drainage, and easier harvest.

Container and Growbag Options

• Container Requirements: Minimum 30 cm depth and diameter per tuber; ensure adequate drainage holes.
• Layering: Start with 10 cm of compost, add 2–3 seed potatoes, then top up as shoots develop.

These planting methods suit a range of spaces—from traditional rows to urban balconies.

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Care and Maintenance for June-Sown Potatoes

Earthing Up (Hilling)

• First Earthing Up: When shoots reach 10 cm, mound soil or compost up around stems, leaving the top leaves exposed.
• Second Earthing Up: Repeat when new growth is 10 cm above the first ridge to support tuber formation and protect from light.

Watering and Mulching

• Consistent Moisture: Provide 2–3 cm per week; use drip irrigation or soaker hoses to water at the base.
• Mulch Layer: Apply straw or grass clippings between rows to conserve moisture and suppress weeds.

Feeding Schedule

• Potash Boost: Apply a high-potassium feed (tomato fertiliser works well) 4–6 weeks after planting to promote tuber bulking.
• Side-Dressing: Lightly fork in a balanced granular feed mid-season.

Weed and Pest Control

• Weeding: Hand-weed early to avoid disturbing tubers; shallow hoeing is ideal.
• Slugs & Snails: Set beer traps or use organic pellets around emerging shoots.
• Vole Protection: Install wire mesh beneath trenches in areas prone to vole damage.

Dedicated care routines optimize tuber size, quality, and yield.

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Pest and Disease Management

Late Blight Vigilance

• Inspection: Check foliage weekly for brown lesions on leaves and stems, especially in humid weather.
• Action: Remove and burn infected foliage immediately; consider permitted copper-based sprays if blight pressure is high.

Colorado Potato Beetle

• Monitoring: Look for striped larvae and adult beetles on foliage.
• Control: Hand-pick beetles and larvae into a bucket of soapy water; use neem oil sprays as an organic deterrent.

Fungal Diseases

• Scab Prevention: Maintain soil pH below 6.5; avoid excessive liming.
• Blackleg & Soft Rot: Use certified seed potatoes and avoid waterlogged conditions.

Proactive integrated pest management keeps your late-season crop healthy.

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Harvesting June-Planted Potatoes

New Potatoes

• Timing: Harvest second early varieties once plants flower or 70–80 days after planting.
• Method: Gently fork under ridges, lifting hand-sized tubers; avoid bruising.

Maincrop Tubers

• Timing: Leave to mature until foliage dies back naturally (100–120 days), often in September or October.
• Lift-and-Cure: After lifting, spread tubers in a shaded, airy spot for 2–4 hours to toughen skins.

Storage Best Practices

• Cleaning: Brush off excess soil; do not wash (wet tubers rot quickly).
• Curing: Store at 10–15 °C with 90–95% humidity for two weeks to mature skins.
• Long-Term: Transfer to a cooler (4–7 °C), well-ventilated, dark storage in mesh bags or crates, keeping tubers out of sight to prevent greening.

Efficient harvest and storage ensures a steady supply of potatoes through winter.

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Common Mistakes to Avoid with Late Potato Planting

1. Planting Too Deep or Too Shallow
   • Depth affects emergence and tuber quality—adhere to the 10 cm guideline.
2. Skipping Earthing Up
   • Without hilling, tubers turn green and develop bitter solanine.
3. Overwatering
   • Waterlogging encourages rot—maintain moist but not saturated soil.
4. Ignoring Blight Signs
   • Late blight can destroy crops rapidly; remove infected foliage at once.
5. Crowding Seed Tubers
   • Overly dense planting reduces tuber size and increases disease risk.

Avoid these missteps to maximize your late potato yields.

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Conclusion

Yes, you can still plant potatoes in June! With the right varieties, meticulous soil preparation, precise planting methods, and diligent care and pest management, your June-sown potatoes can yield delicious new tubers by late summer and maincrop potatoes well into autumn. Embrace late-season potato planting to extend your harvest window, fill empty beds, and enjoy homegrown spuds beyond the traditional spring sowing period.

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Top 10 Questions & Answers

1. Can I plant seed potatoes in June and expect a good harvest?
   Absolutely—choose fast-maturing second early or early maincrop varieties for a 70–90-day harvest.
2. Should I chit potatoes before planting in June?
   Yes—chitting accelerates emergence, giving you faster growth in a shorter season.
3. How deep should I plant June-sown potatoes?
   Plant 10 cm deep, then earth up twice to build ridges and protect tubers from light.
4. What potato varieties are best for June planting?
   ‘Charlotte’, ‘Rocket’, ‘Swift’, and ‘Maris Peer’ are top picks for late-season sowing.
5. How often should I water late-planted potatoes?
   Aim for 2–3 cm of water per week, delivered deeply via drip irrigation or soaker hoses.
6. When do I earth up June-sown potatoes?
   First when shoots reach 10 cm, then again at an additional 10 cm of growth.
7. How do I prevent blight on my June potato crop?
   Monitor foliage weekly, remove any lesions immediately, and apply a permitted fungicide if needed.
8. Can I grow potatoes in containers in June?
   Yes—use 30 cm+ deep containers, layer compost and tubers, and earth up as shoots emerge.
9. When is the earliest I can harvest June-sown potatoes?
   Second earlies can be lifted in about 70 days (late August); maincrop in about 100 days (October).
10. How should I store my late potato harvest?
    Cure tubers at 10–15 °C for two weeks, then store at 4–7 °C in a dark, ventilated space in mesh bags.

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