Spring onions are a great crop for gardeners and farmers alike because they can be harvested multiple times through a technique called "cut-and-come-again." This means you can cut the green part of the onion while leaving the root intact, allowing it to regrow for future harvests. To optimize your yield, plant the onions in well-drained soil and make sure they get enough sunlight and water. Regularly cutting the greens encourages new growth, making it possible to enjoy fresh spring onions over an extended period. Additionally, keeping an eye out for pests and diseases can help maintain healthy plants, ensuring that your spring onion harvest is bountiful and delicious throughout the season.
Permaculturist | IT Specialist | Soil Systems Architect
Applying system engineering to organic soil biology at Evergreen Hideout Agricultural Services.
July 4, 2026 • 21 min read • Soshanguve, Pretoria"Spring onions are the gift that keeps giving. Harvest the tops, leave the roots, and they come back stronger. That's not just a crop — that's a renewable food source."
Spring Onion Harvest: Cut-and-Come-Again Yield Optimization
Managing a continuous winter crop cycle requires knowing exactly when and how to harvest to maintain field efficiency. Today, we're sharing a quick development update on our spring onions here at Evergreen Hideout, detailing the manual harvesting workflow that keeps our yield high and our soil systems functioning optimally.
This post serves as the first major harvest update for our spring onions (Post #8), covering approximately 8 weeks of development from planting (May 7) to mid-season harvest (July 4).
System Overview: Spring Onion Timeline and Metrics
Before we dive into the harvest steps, let us establish where the spring onions stand in their growth cycle:
Planting timeline:
- Transplant date: May 7, 2026 (Post #8)
- Days since transplant: 58 days (approximately 8 weeks)
- Variety: 'Evergreen Hardy White' (Japanese bunching onion, cold-tolerant, bolt-resistant)
- Number of clusters: 18 clusters (each cluster contains 3–5 seedlings)
- Spacing: 15cm between clusters, 25cm between rows
Key interventions applied since planting:
- Fish fertilizer (Post #10): Applied every 14 days starting May 21 (3 applications total: May 21, June 4, June 18).
- Feather compost top-dressing (Post #13): Applied June 5 (approximately 3–4cm layer).
- Weed management (Post #9): Hand-pulled weeds every 7–10 days.
- Mulch maintenance (Post #5): Mulch layer maintained at 8–10cm depth.
- Watering: Deep watering (0.5–1 liter per cluster) every 5–7 days, depending on rainfall.
Growth metrics — current status (July 4):
- Average plant height: 20–25cm (from soil surface to top of leaves).
- Average stem diameter: 5–8mm (pencil thickness).
- Average leaves per cluster: 6–10 leaves (mix of mature outer leaves and young inner leaves).
- Leaf color: Deep green with white stems — excellent health.
- Overall health rating: 9/10 (minor insect damage, no disease).
Harvests taken so far:
- First harvest: June 7 (Day 31) — approximately 6 clusters, 0.3kg total.
- Second harvest: June 28 (Day 52) — approximately 10 clusters, 0.5kg total.
- Third harvest: July 4 (Day 58 — this post) — approximately 12 clusters, 0.6kg total.
- Total cumulative harvest (first 8 weeks): 28 clusters, approximately 1.4kg from 18 clusters.
- Yield per cluster: Approximately 50g per cluster (cumulative).
- Yield per square meter: Approximately 467g per square meter (cumulative).
The cut-and-come-again cycle:
- Spring onions regenerate after harvesting. We cut the green tops 5cm above the soil line, leaving the white base and roots intact.
- New shoots emerge within 10–14 days.
- Each cluster can be harvested 4–6 times over 8–10 months.
- Regrowth time: 10–14 days in winter (slower than summer's 7–10 days).
- Our harvested clusters are already showing new shoots emerging (visible 5 days after cutting).
Step 1: Assessing Crop Maturity
As captured in the image, the spring onions have established exceptional vertical leaf structure within our raised bed channels. The rich biological matrix provides consistent nourishment, driving strong, clean stalks that are uniformly ready for selective thinning and harvest.
What we look for during maturity assessment:
- Height: Spring onions are ready when they reach 20–25cm in height. Under 15cm is too small; over 30cm may be tough or starting to bolt.
- Stem diameter: Pencil thickness (5–8mm). Thinner stems are still growing; thicker stems may be over-mature.
- Leaf color: Deep green indicates adequate nitrogen. Pale green or yellow indicates nutrient deficiency.
- Stem texture: Crisp and firm. Wilted or floppy stems indicate stress or age.
- Pest damage: Minor damage (small holes) is acceptable. Major damage (large holes, yellowing) indicates pest pressure.
- Overall vigor: The plant should look healthy and upright, not drooping or yellowing.
Our batch assessment: Height 20–25cm, stem diameter 5–8mm, leaf color deep green, stems crisp and firm, minor pest damage (less than 5% of leaves), excellent vigor — ready for harvest.
Step 2: In-Field Health and Quality Inspections
Maintaining high-yield quality means running constant diagnostics on your standing crops. As shown in the image, I am examining the spring onion tops, leaves, and overall green health down the line. Checking for tip-burn, hidden pests, or nutrient deficiencies ensures that only the absolute best, premium stalks are selected for market readiness.
Quality inspection checklist — what to look for:
- Tip-burn: Brown or yellow tips indicate nutrient burn (too much fertilizer) or underwatering. None found.
- Pests: Check leaf axils for aphids, thrips, or onion flies. Minor aphid activity found (less than 5 per cluster) — below action threshold.
- Nutrient deficiencies: Pale green or yellow leaves indicate nitrogen deficiency. None found.
- Disease: White powdery spots (mildew) or rust-colored spots. None found.
- Mulch condition: Mulch should be intact (8–10cm thick), not matted down. Our mulch is intact.
- Soil moisture: Soil should be damp but not waterlogged. Our soil is moist.
Selecting which clusters to harvest:
- We harvest clusters that have reached full size (20–25cm).
- We leave smaller clusters (under 15cm) to grow for the next harvest.
- We avoid harvesting clusters that show signs of stress or disease.
- We rotate harvests across the bed to allow even regrowth.
- For this harvest (July 4), we selected 12 clusters out of 18 — approximately 67% of the bed.
Step 3: Softening the Soil Matrix with Pre-Harvest Irrigation
To prevent structural root damage during extraction, timing is everything. In the image, we apply a targeted overhead irrigation loop directly to the bed zones before harvesting. Wetting the compost media ensures the soil becomes loose and moist, allowing us to smoothly ease the crops out without causing unnecessary stress to the root systems or surrounding soil structure.
Pre-harvest irrigation protocol:
- Timing: Water the bed 1–2 hours before harvesting. This gives the water time to penetrate the soil without making it muddy.
- Volume: 5–10 liters per square meter. Enough to moisten the top 10–15cm of soil.
- Water temperature: Room temperature (18–22°C). Cold water (10–12°C) shocks roots.
- Application method: Gentle shower using a hose nozzle or watering can. Do not use a jet nozzle — it can damage the plants.
- Why pre-irrigation works: Moist soil is looser and easier to pull from. Dry soil clings to roots, causing breakage and stress.
When to skip pre-irrigation:
- If it rained within 24 hours and the soil is already moist.
- If the soil is waterlogged (wait for it to dry slightly).
- If you are harvesting during heavy rain (wait for a dry window).
Step 4: Pulling and Processing the Harvest
In the video demonstration, you can see the precise workflow in action right after the irrigation run. Because the soil is perfectly moist, I can pull the spring onions steadily from the ground by hand with minimal effort. This preserves the root system completely intact before shaking loose the damp earth and cutting down the green tops directly in the field for clean bundling.
Harvesting technique — the hand pull:
- Grasp the cluster at the base (near the soil line). Do not pull the leaves — they will break.
- Gently rock the cluster back and forth to loosen the soil.
- Pull straight up with steady pressure. The roots should slide out cleanly.
- If the cluster does not release, water the bed more deeply and wait 30 minutes.
- Do not yank or jerk — this tears the roots and damages the plant.
In-field processing — the cut-and-come-again method:
- Instead of pulling the entire plant (roots and all), we cut the green tops 5cm above the soil line.
- We leave the white base and roots intact in the ground.
- The plant will regenerate from the base within 10–14 days.
- This method provides continuous harvests from the same cluster for 6–8 months.
- If you need the entire plant (for market sales with roots attached), pull the whole plant. But for home use, cut-and-come-again is more productive.
Root trimming (if pulling whole plants):
- If pulling the whole plant, trim the roots to 2–3cm length.
- Shake off excess soil but do not wash — washed roots rot faster in storage.
- Trim the green tops to 15–20cm length (if not already cut).
- Bundle into groups of 10–12 plants for market or kitchen use.
Our harvest method: We use the cut-and-come-again method for home use and market sales. We cut the tops 5cm above the soil line, leaving the base to regrow. The cut tops are bundled and washed for sale.
Response to Interventions: Fish Fertilizer and Feather Compost
Fish fertilizer response (Post #10):
- We applied fish fertilizer every 14 days starting May 21 (3 applications total).
- Observed response: Leaves became darker green within 3–4 days of each application. New growth accelerated noticeably. Stem diameter increased from 3–4mm (May) to 5–8mm (July).
- Conclusion: Fish fertilizer is effective for spring onions, but they are lighter feeders than chard. The 1:20 dilution rate (half-strength) was appropriate — we saw no signs of nitrogen burn.
- Future plan: Continue every 14 days through August, then reduce to once monthly as growth slows.
Feather compost response (Post #13):
- We applied feather compost as a top-dressing on June 5 (approximately 3–4cm layer).
- Observed response: Within 10–14 days, leaves became noticeably thicker and greener. The compost appears to have provided a slow-release nitrogen boost that complements the fish fertilizer.
- Conclusion: Feather compost is an excellent complement to liquid fertilizer. It provides long-term soil building and steady nutrition.
- Future plan: Reapply a thin layer (1–2cm) in late August to support spring growth.
Harvest Takeaways
- Pre-Irrigation Leverage: Watering your beds immediately before pulling loosens the soil matrix, making manual extraction effortless and saving root integrity. In dry winter conditions, this step is non-negotiable.
- Manual Precision: Lifting onions smoothly by the base of the stalk prevents tearing the outer sheaths and keeps the bunch pristine. Gentle handling is the key to a marketable product.
- In-Field Topping: Snapping or trimming the top growth directly by hand during harvest reduces post-harvest moisture loss from the roots. This extends shelf life by 2–3 days.
- Cut-and-Come-Again Sustainability: By leaving the white base and roots intact, we ensure continuous harvests from the same clusters for 6–8 months. This is the most efficient way to grow spring onions in a small space.
Failure Mode Analysis: Spring Onion Harvest Edition
Failure 1: Roots break off in the soil (plant comes up without roots). Cause: Soil was too dry, or the plant was pulled too quickly. Recovery: None — the plant will not regrow without roots. Prevention: Pre-irrigate the bed 1–2 hours before harvest. Pull slowly and steadily, not in a single jerk.
Failure 2: Leaves wilt immediately after cutting (cut-and-come-again method). Cause: Cut too close to the soil line (under 3cm), damaging the growing point. Recovery: None — the plant will not regrow. Prevention: Cut at 5cm above the soil line. Leave enough stem for new shoots to emerge.
Failure 3: Regrowth is slow (takes longer than 14 days). Cause: Winter temperatures (slower growth) or nutrient deficiency. Recovery: Apply a light fish fertilizer (1:20) after cutting. Prevention: Maintain consistent soil moisture. Apply fish fertilizer every 14 days during the growing season.
Failure 4: Spring onions bolt (flower) prematurely. Cause: Temperature stress (cold spell followed by warm spell) or daylength increasing (spring). Recovery: Harvest immediately — the plant is ending its production cycle. Prevention: Plant bolt-resistant varieties ('Evergreen Hardy White'). Plant in autumn (May) so the plant matures before spring daylength triggers bolting.
Failure 5: Pests (aphids, thrips) attack the new growth after cutting. Cause: Fresh growth attracts pests. Recovery: Spray with soapy water (1 teaspoon castile soap per liter) every 3 days until pests are gone. Prevention: Plant garlic or onions nearby — alliums repel pests. Use floating row cover for the first 2 weeks after cutting.
Integration with the Series
- Post #8 (Spring Onion Planting): The original planting of our spring onions on May 7.
- Post #5 (Mulch Firewall): The mulch layer that is protecting our spring onions in winter.
- Post #9 (Weed Management): Weeding protocol that kept the spring onion beds clean.
- Post #10 (Fish Fertilizer): Liquid feeding protocol that is driving growth.
- Post #13 (Feather Compost): The top-dressing that provided slow-release nutrition.
- Post #20 (This post — Spring Onion Harvest): Mid-season harvest update and cut-and-come-again protocol.
- Post #21 (Upcoming — Cauliflower Update): We will provide a growth update on our cauliflower crop.
Seasonal Timing: Why July 4 Works for Harvesting
In Soshanguve, spring onions can be harvested from June through August. Our July 4 harvest is well within the window. Here is the analysis:
- Advantage: Spring onions grow slowly in winter but produce sweet, tender stems. Cold weather reduces pest pressure and improves flavor (sugars concentrate in the stems).
- Risk: Harvesting too early reduces yield; harvesting too late results in tough, woody stems.
- Mitigation: We harvest when stems reach pencil thickness (5–8mm) and 20–25cm height — the ideal market size.
- Expected regrowth: 10–14 days for new shoots to emerge. We will harvest again in mid-July.
- Continuous harvest: Spring onions can be harvested every 10–14 days through the winter, providing a steady supply of fresh greens.
What's Next?
We'll continue tracking the regeneration rate of these beds as we move through the season.
The next post will be about updating our cauliflower post.
Back in Post #15 (Brassica Systems), we planted our cauliflower seedlings into the compost-amended beds. It has now been approximately 3.5 weeks since planting (June 11 to July 4). The cauliflower has gone through its initial establishment phase, and it is time to provide a full growth update — including how it has responded to the feather compost top-dressing (Post #13), the winter conditions in Soshanguve, and our ongoing maintenance protocols.
The next post will cover:
- Growth metrics: Current plant size, leaf count, and overall health compared to the planting date. We will measure leaf length, width, and number per plant to track progress toward head formation.
- Head development check: Cauliflower heads (curds) typically begin forming 4–6 weeks after transplant. We are approaching that window. We will inspect for early signs of head initiation.
- Response to interventions: We applied feather compost (Post #13) on June 5 and have been maintaining the mulch layer. Has there been a visible growth response? How is the cauliflower handling the winter conditions?
- Winter performance: Cauliflower is a cool-season crop but sensitive to extreme cold. How is it handling Soshanguve's winter temperatures (10–22°C days, 2–10°C nights)? Have we seen any frost damage or cold stress?
- Pest and disease check: Have we seen any cabbage worms, aphids, or downy mildew on the cauliflower? How are we managing them?
- Cutworm protection review: We applied cardboard collars at planting (Post #15). Have they been effective? Do we need to reapply or use alternative methods?
- Upcoming blanching: For white cauliflower varieties, heads need to be blanched (tied leaves over the curd) to prevent sunburn and discoloration. We will discuss when and how to blanch.
- Expected harvest timeline: Cauliflower typically takes 60–90 days from transplant to harvest. With our June 11 planting date, we expect heads to form in August–September. We will track progress toward harvest.
- Comparison to other brassicas: How does cauliflower compare to our kale (Post #16) in terms of growth rate and cold tolerance?
This cauliflower update will continue our mid-season audit of all the major crops in our system — chard (Post #17), garlic (Post #18), leeks (Post #19), spring onions (Post #20), and now cauliflower. Together, these updates will give us a comprehensive picture of how our soil-building efforts are translating into actual food production across multiple crop types.
Stay tuned for the next update from Soshanguve. Keep your hands in the soil and your logs updated.
If you are just joining the Real Grow series, catch up here:
Post #2: The Tool Logic – Land Clearing & Pick-Mattock Technique
Post #3: Below the Surface: The Masterclass on Soil Turning and Root Extraction
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