In short: Compressed coco coir bricks beat bagged coir for storage: 5 kg compressed = 75 L hydrated, takes a fraction of the space, and stays stable indefinitely if kept dry. Store bricks indoors or in a dry shed; once hydrated, use within a week or store loose damp coir in a sealed bag for up to a month before drying.
Coco coir (also known as coco peat) bricks are brilliant for storage compared to traditional bags. But there are right and wrong ways to keep them. Here's everything you need to know.
Why Compressed Bricks Beat Bags
Space Efficiency
A single 5kg brick fits in a shoebox and expands to 75 litres. A bag of loose coir sprawls everywhere. If you're gardening in a small space, bricks are a no-brainer.
Consistency
Compression prevents coir from settling, crushing, or degrading unevenly. Loose bags shift and compact over time, creating consistency problems. Bricks maintain their structure.
Moisture Control
Bags allow moisture to migrate unevenly, especially if stored in variable humidity. Compressed bricks resist moisture ingress better and hydrate more evenly.
Durability
A bagged product can tear, spill, get punctured. Bricks are robust. Store them properly and they'll last for years untouched.
Aesthetic
Honest advantage: bricks look neater stacked in a shed than sprawling bags of coir. If your partner gets annoyed by gardening clutter, bricks help.
Ideal Storage Conditions
Temperature
- Best: 10-20°C (cool shed, garage, basement)
- Acceptable: 5-25°C
- Avoid: Below 5°C (coir degrades faster in cold, damp conditions) or above 30°C consistently (can speed degradation)
Room temperature indoors is perfect. Outdoor sheds are fine unless they're extremely cold or damp.
Humidity
- Best: 40-60% relative humidity (dry indoors)
- Acceptable: 30-80%
- Avoid: Above 80% for extended periods (mould risk), or extremely dry conditions (bricks can crack—though this doesn't affect usability)
A dry shed or garage is ideal. A greenhouse or polytunnel is acceptable if it's not excessively humid.
Light
- Best: Darkness or indirect light
- Acceptable: Dappled light through a window
- Avoid: Direct sunlight for extended periods (can degrade the coir slightly and cause discolouration)
Store indoors or under cover. No UV damage, no colour fading.
Ventilation
Adequate air circulation prevents mould and odour buildup. Don't seal bricks in airtight containers long-term. A dry, airy shed is perfect.
Storage Setup
Stacking
Bricks stack beautifully. Stack them: - 2-3 bricks high without issue (they don't compress under their own weight) - On a shelf, bench, or pallet (keep them off damp ground) - With a thin gap between stacks (allows minor air circulation)
Don't stack 10+ bricks on top of each other for extended periods (unnecessary), but 2-4 is fine.
Organization
Label your bricks: Mark the purchase date (or expiry estimate) with a marker. Coco coir doesn't really "go bad," but knowing which batch is oldest helps rotate stock.
Group by size: If you stock both 5kg and 15kg packs, organize them separately. Makes it faster to grab what you need.
Protection
Store bricks on a shelf or bench, not directly on damp concrete. If your storage space tends toward damp, use a thin sheet of cardboard or wood underneath.
If you're in a very humid climate, consider adding a small desiccant bag (silica gel) nearby to control moisture—but this is overkill for most UK sheds.
Long-Term Storage (6+ Months)
Coco coir bricks are genuinely shelf-stable. A properly stored brick will keep for 2+ years without degradation. Here's how:
- Keep them dry: The key factor. Moisture + warmth = potential for degradation.
- Keep them cool: Room temperature or cooler is fine. Avoid heat.
- Minimal light: Indirect light is fine; direct sun for weeks is unnecessary.
- Air circulation: Don't seal bricks in plastic or airtight containers. A cardboard box with ventilation is perfect.
- Off the ground: Even in a shed, keep bricks on a bench or shelf to avoid ground moisture seeping in.
Following these guidelines, you can safely store bricks for 2+ years and use them with the same performance as fresh stock.
Storage in Different Spaces
Garden Shed
Ideal. Cool, dry, well-ventilated. Store bricks on a shelf or bench. Covers approximately 90% of UK gardens.
Garage
Ideal. Temperature-controlled, dry. Stacks neatly against a wall. No issues.
Basement or Cellar
Good if dry. Cool and dark are advantages. Just ensure it's not damp—if there's moisture or musty odours, ventilation may be needed.
Polytunnel or Greenhouse
Acceptable in winter, when humidity is lower. Avoid in summer, when heat and humidity could cause degradation. Bricks work fine if stored in an unheated poly over winter, but move them into a shed in warmer months.
Outside (Covered)
Okay with caveats. A covered patio or under a tarp works short-term (weeks to months). Long-term outdoor storage (months to years) risks variable moisture and temperature fluctuations.
Indoors (Cupboard, Spare Room)
Perfectly fine. Cool, dry, indoors is ideal. No disadvantage to storing bricks in a cupboard if space allows.
NOT Recommended:
- Direct sunlight areas
- Damp basements
- Above radiators or heat sources
- Unheated outdoor storage long-term
- Sealed plastic containers (lack air circulation)
Handling & Transport
Carrying
Bricks are dense but manageable. A single 5kg brick weighs ~5kg (obviously), so carry like you'd carry a textbook. A 15kg 3-pack weighs ~15kg total—reasonable for one person to carry or shift.
Loading Into Cars
Stack bricks efficiently. They won't shift if stacked properly, and they take minimal boot space.
Transport Outdoors
Bricks are robust. Weather-resistant for short trips (hours to a day), but don't leave them exposed to heavy rain for extended periods if possible.
Using Stored Bricks
Bricks stored 6, 12, or 24 months ago hydrate and perform identically to fresh stock (assuming proper storage).
To use: 1. Remove from storage 2. Place in container with warm water 3. Hydrate and expand (20–30 minutes) 4. Use as normal
There's no "settling in" period or need to test batch viability. Stored bricks perform immediately.
Shelf Life & Viability
Simple answer: Coco coir bricks don't really expire.
Properly stored, they'll: - Remain usable for 2+ years - Maintain consistent performance indefinitely - Not degrade from storage alone (no "best by" date)
The only degradation comes from: - Moisture + warmth + time (rare if stored properly) - Mould (prevented by adequate ventilation) - Physical damage (compression, crushing—unlikely for bricks)
If your brick looks, feels, and smells normal, it's fine. No shelf-life concerns with properly stored coco coir.
Cost Benefit: Store Now, Use Later
This is an often-overlooked advantage of compressed bricks:
Buy a supply in autumn when you have time and money. Store through winter. Use throughout spring/summer gardening season.
Advantages: - Spread cost over time - Never run out mid-season - No rushing to the garden centre - Stock your favourite product before seasonal shortages
One customer stocks 3-4 bricks in their shed in November and uses them gradually through the year. No stress, no waste.
FAQ
Q: Will a stored brick go moldy? A: Extremely unlikely if kept dry and ventilated. Mould requires moisture + warmth + stagnant air. A properly stored shed doesn't have all three.
Q: Can I store bricks in sealed plastic? A: Not ideal long-term (moisture can accumulate inside). Cardboard box with ventilation is better. Short-term (weeks) in plastic is fine.
Q: Do bricks dry out in storage? A: They're already dry when compressed. They won't dry further. They might absorb slight moisture in very humid climates, but this doesn't affect usability.
Q: How often should I rotate my stock? A: No rotation needed. FIFO (first in, first out) is a nice idea but not necessary. All properly stored bricks are equally viable.
Q: Can I store bricks outside in a waterproof container? A: Yes, if you ensure it's truly waterproof and has ventilation. Rain seeping in defeats the purpose. Overkill for most people—a shed is simpler.
Q: Do bricks compress further if stacked? A: No. They're already compressed to their final density. Stacking won't crush them further.
The Bottom Line
Store coco coir bricks in a cool, dry, well-ventilated space. They'll last for years, perform consistently, and take up minimal room.
This is why bricks beat bags: durability, consistency, and storage efficiency. Stock them in autumn, use them year-round, and never stress about running out.
Shop buffered coco coir bricks at Blue Apple Garden
Related Reading
Related: Find out how long coco coir lasts and learn how to rehydrate and reuse it across multiple seasons.
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