Spring Onion Pompeii

🌱 Sowing: In Trays vs. Direct in the Garden

In Trays (Recommended for most regions)

Starting onions in trays gives you a head start and allows for better control over spacing later on.
Best time to sow:

• Temperate & Cool zones: May–August
• Subtropical zones: April–June
• Arid zones: April–July

How to sow:

• Use a quality seed-raising mix.
• Sow seeds 2mm deep.
• Keep trays in a sunny, sheltered spot or greenhouse.
• Thin seedlings once they’re a few centimetres tall, or leave a few to snip as microgreens.

🌼 Tip: Onions are slow starters. Be patient—it may take 10–14 days for germination.

Direct Sowing

Direct sowing is possible in mild climates with well-prepared, weed-free soil.

• Sow shallowly, 0.5–1 cm deep.
• Thin seedlings to 10–15 cm apart as they grow.
• Keep beds moist during germination.

🌿 My advice? Go with trays first if you’re dealing with clay soil, slugs, or heavy rain. You’ll get stronger seedlings and better spacing at transplant time.

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🧱 Soil and Position

Soil Type:

• Onions prefer free-draining, fertile soil with a neutral pH (6.0–7.0).
• Add well-rotted compost or aged manure a few weeks before planting.

Position:

• Full sun is essential for strong bulb development.
• Avoid beds that have recently grown garlic, shallots, or leeks (allium rotation is important to reduce disease risk).

🌼 Gardener’s note: Raised beds or mounded rows are great for drainage, especially in winter-wet areas.

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🌿 Care and Maintenance

• Watering: Regular and consistent—don’t let them dry out or become waterlogged. Reduce watering as bulbs mature.
• Weeding: Keep the bed clean. Onions don’t like competition.
• Feeding: Light feeders—apply a liquid seaweed or fish emulsion every 2–3 weeks early on. Too much nitrogen late in the season can delay bulb formation.

🌱 Tip: Mulching with straw or sugarcane mulch keeps weeds down and moisture even.

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🌼 Companion Planting Guide

Good Companions	Why It Works
Carrots	Mutual pest protection (onions deter carrot fly)
Beets	Similar soil needs and growth habits
Lettuce	Shallow-rooted, fills space between rows
Chamomile	Improves onion flavour
Strawberries	Onions deter pests like aphids

🚫 Avoid planting near: Peas, beans, or other legumes—onions can stunt their growth.

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🌾 Harvesting

Green Onions / Spring Onions

• Harvest when leaves are 15–20 cm tall and stalks pencil-thick.
• Usually ready 8–10 weeks from sowing.

Pickling Onion

• Timing: Around 10–12 weeks after sowing, depending on variety and conditions.
• Look for bulbs that are starting to swell but are still small and firm.
• Leaves will still be upright and green (they don’t need to flop like storage onions).

Bulbing Onions

• Ready in 20–26 weeks depending on variety and growing conditions.
• Wait until the tops yellow and fall over naturally. Stop watering at this stage.
• Allow bulbs to “cure” in a dry, airy spot for 2–3 weeks before storing.

🌿 Harvest tip: Gently lift with a fork—don’t yank, or you risk bruising them.

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🐛 Common Issues & Fixes

Problem	Symptom	Fix
Poor bulb development	Lots of leaves, no bulb	Too much nitrogen or overcrowding—thin seedlings & avoid overfeeding late
Downy mildew	Pale patches, stunted growth, fuzzy spores on leaves	Improve airflow, avoid overhead watering, use organic fungicide
Onion thrips	Silvery streaks, curling leaves	Neem oil spray, encourage lacewings and ladybirds
Bolting (flowering early)	Tall central stalk with flower	Sow at the right time, protect from cold snaps
Rot or fungal disease	Yellowing, mushy base, or collapsed stems	Ensure well-drained soil, rotate crops, don’t overwater

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🌼 Seed Saving Guide

Saving onion seed takes patience, but it’s very doable if you let your plants go full cycle.

1. Biennial nature:

• Onions need two seasons to set seed. In the first year, they grow bulbs; in the second, they flower.

2. Selecting parent plants:

• Choose the healthiest, most typical bulbs (good shape, no disease, strong storage quality).
• Allow them to cure and store over summer.

3. Replanting:

• In autumn or early winter, replant the bulbs in prepared soil.
• The plant will flower in spring, forming beautiful umbel heads full of seeds.

4. Pollination:

• Onions are insect-pollinated and can cross with other onion varieties.
• To maintain a pure variety, only grow one type for seed or space them 1 km apart.

5. Harvesting seed:

• Wait until the flower heads turn brown and dry.
• Snip off the heads into a paper bag and dry further indoors.
• Rub heads to release seeds, winnow out chaff, and store in a cool, dry place.

🌿 Lifespan of onion seed: About 1–2 years with good viability if stored well.

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🌻 Final Thoughts

Growing onions from seed might take a bit of patience, but it’s well worth the effort. Starting them off right—especially in trays—sets you up for a strong, healthy crop that stores well into the warmer months. They’re not heavy feeders, but they do need consistency and care, especially when young. And while they’re not the flashiest crop, they quietly anchor the garden and the kitchen alike.

So go on—pop a few trays in this season, keep an eye on spacing and weeds, and let your onions quietly do their thing. Before you know it, you’ll have a harvest that smells sweet and earthy, ready to lift and cure with pride. 🧅💚

🌿 Sowing: In Trays vs Direct

🧺 Sowing in Trays

Starting spring onion seed in trays gives you more control over spacing, watering, and germination success—especially helpful in cooler or unpredictable weather.

• When to sow: All year round in most areas, but best in early spring and autumn in very hot zones.
• Tray depth: Use shallow seed trays with fine, moist seed-raising mix.
• Spacing: Sow thinly, barely covering the seed. Rows can be close—spring onions don’t mind being planted densely.
• Germination: Takes 7–14 days, depending on temperature.
• Transplanting: Once seedlings are about 10cm tall, gently tease them apart and plant in clumps of 3–5 for easy harvesting later.

📝 Tip: Let them grow close—it’s one of the few veggies that thrives when grown cheek-by-jowl!

🌱 Sowing Direct

Direct sowing is just as effective, especially in milder climates with consistent moisture.

• Prepare the bed: Rake the soil smooth and moist, sow seeds 5mm deep.
• Row spacing: Around 15–20cm apart. Thin seedlings later to every 2–3cm or leave in clusters.
• Mulch lightly after sowing to retain moisture.

🪴 Either method works well—choose what suits your space and schedule.

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🌾 Is Seed Pre-Treatment Required?

No pre-treatment is required for spring onion seeds. They germinate reliably with warmth and consistent moisture. However, soaking seeds in lukewarm water for a few hours can help speed up germination if you’re sowing into cooler soil.

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🌞 Soil and Position

Spring onions are undemanding but will reward you with strong, flavourful growth if their soil is just right.

• Soil type: Loose, well-drained, and rich in organic matter. Sandy loam is ideal.
• pH level: Slightly acidic to neutral (6.0–7.0).
• Sunlight: Full sun is best, though they’ll tolerate part shade.
• Drainage: Essential—waterlogged roots are a quick path to rot.

Before planting, work in plenty of compost or well-rotted manure and ensure the bed is free of large clumps or stones.

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🌿 Care and Maintenance

• Watering: Keep the soil evenly moist. Don’t let them dry out completely or they may bolt (go to seed).
• Mulching: A thin layer of straw or sugarcane mulch helps retain moisture and keep weeds at bay.
• Feeding: Apply a liquid seaweed or fish emulsion fortnightly. Side-dress with compost mid-season if needed.
• Weeding: Keep weeds down, especially while young. Onions don’t like competition!

🧅 Tip: For a continuous harvest, sow small batches every few weeks.

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👩‍🌾 Companion Planting

Spring onions play well with others! They’re great companions for many crops thanks to their pest-repelling qualities.

Good Companions	Why
Carrots	Deters carrot fly
Beets	Shared soil preferences
Lettuce & leafy greens	Similar water and light needs
Strawberries	Repels pests that bother strawberries
Cabbage family (broccoli, etc.)	Repels aphids, moths

🚫 Avoid planting near: Peas and beans—onions can stunt their growth.

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✂️ Harvesting

Spring onions can be harvested at nearly any stage—from slender baby shoots to thick, fully-mature stems.

• Time to maturity: 8–12 weeks from sowing.
• How to harvest: Grasp firmly at the base and pull gently. For an ongoing harvest, take only the largest and let the others mature.
• Regrowth: Some varieties will resprout from the base—leave the roots in and let them regrow!

🛒 Tip: If you’ve planted in clumps, you can harvest a few stems at a time without disturbing the rest.

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🐛 Common Issues and Fixes

Here’s a quick table to troubleshoot common spring onion issues:

Issue	Symptoms	Fix
Bolting (early flowering)	Flowers before maturing	Keep soil moist, avoid heat stress, sow at right time
Poor germination	Patchy seedlings	Use fresh seed, pre-soak, keep soil evenly moist
Yellowing tips	Nutrient deficiency or inconsistent water	Liquid feed and consistent watering
Rotting at base	Mushy, smelly base	Improve drainage, avoid overwatering
Thrips or aphids	Silvery streaks or sticky leaves	Spray with neem oil or hose off pests regularly

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🌼 Seed Saving Guide

Spring onions are biennial and will flower in their second year if left in the ground.

1. Choose healthy plants to overwinter.
2. Allow to bolt in the second year—tall flower stalks with globe-like blooms will emerge.
3. Pollination: Insects like bees will do the work.
4. Seed maturity: Wait until the flower heads dry and turn brown on the plant.
5. Harvesting seeds: Clip the heads, dry further in a paper bag, then shake out seeds.
6. Cleaning and storing: Remove chaff and store seeds in a cool, dark place. Label with date—onion seeds have a short shelf life (1–2 years).

🧺 Tip: Spring onions can cross-pollinate with other Alliums, so isolate if you’re also saving onion, shallot or leek seed.

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🌱 Final Thoughts

Spring onions are a brilliant crop to keep on the go all year round. They tuck neatly into small spaces, help out their garden neighbours, and come through when you need a quick harvest. If you’re looking for an easy, productive win—this is it.

Whether you’re sowing a few rows along the veggie patch edge or keeping a constant tray rotation going on the balcony, spring onions bring flavour and freshness in spades. Give them a sunny spot, keep them moist, and you’ll be snipping your way to garden-to-table goodness in no time.

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