“Don’t throw away your rice water — it’s good for your plants!”
We’ve all heard it from nenek, makcik, or even viral TikTok gardeners. But is it true? Can that cloudy water from rinsing rice really help your garden grow? Or is it just a gardening myth that’s been passed down for generations?
At Project HARVEST, we decided to test it out — and the results may just surprise you 👀🌾
🌾 What is Rice Water?
Rice water is the starchy liquid left behind after rinsing uncooked rice. It’s milky-white, slightly sweet-smelling, and full of nutrients from the rice’s outer layers.
Depending on how you collect it, there are two main types:
- Raw Rice Rinse Water:
Collected after the first or second wash of raw rice
(before cooking) - Cooked Rice Water:
Collected after boiling rice — thicker and starchier
For gardening, the raw rinse water is generally safer and more effective.
🧪 What’s Inside Rice Water?
- Starch (carbohydrates): Energy for soil microbes
- B-vitamins: May promote root strength
- Small amounts of nitrogen, phosphorus, potassium
- Traces of magnesium and zinc
- Beneficial enzymes & amino acids
While it’s not as nutrient-dense as commercial fertilisers, rice water acts as a mild organic boost, especially for leafy plants.🧪 What’s Inside Rice Water?
- Starch (carbohydrates): Energy for soil microbes
- B-vitamins: May promote root strength
- Small amounts of nitrogen, phosphorus, potassium
- Traces of magnesium and zinc
- Beneficial enzymes & amino acids
While it’s not as nutrient-dense as commercial fertilisers, rice water acts as a mild organic boost, especially for leafy plants.
🌱 Project HARVEST Test Results
We tested rice water on 3 common Malaysian plants over 4 weeks:
| Plant | Growth (vs plain water) | Notes |
|---|---|---|
| Bayam Hijau | +18% taller | Greener leaves, faster sprouting |
| Bunga Telang | +10% flowering | More vibrant petals |
| Pandan | No major change | Grew same as control group |
💡 Conclusion: Rice water helped fast-growing leafy plants the most. Not a miracle, but noticeable results over time!
⚠️ Dos & Don’ts for Rice Water in Gardens
✅ DO:
- Use water from raw rice rinse
- Apply 2–3 times per week
- Use it immediately after collecting
- Water the base of the plant, not the leaves
- Store no more than 1 day in the fridge (it ferments fast!)
❌ DON’T:
- Use cooked rice water (too thick = root rot risk)
- Leave water out in the heat (turns sour fast)
- Use on succulents or cacti
- Apply to already soggy/waterlogged soil
👩🏽🌾 Best Plants to Feed with Rice Water
- Leafy veggies (bayam, sawi, kangkung)
- Ulam plants (pegaga, ulam raja)
- Herbs (basil, daun kesum, Thai coriander)
- Flowering vines (bunga telang, ros jepun)
Skip for:
- Cactus or low-water plants
- Root crops (too much water may rot them)
🧪 DIY Experiment: Try It Yourself!
Set up a simple test at home:
- Two pots with the same plant (e.g., bayam)
- One gets regular water
- One gets rice rinse water (3x/week)
- Monitor for 4 weeks — height, leaf colour, flowering
📸 Tag @projectharvest.my to show us your results!
🍃 HARVEST Tip: Boost It with Banana Peel Water
Mix your rice water with banana peel water (soak banana peels in water for 24 hrs) to add potassium — a DIY nutrient cocktail for flowering plants!
💬 Real Story from the Ground
A follower from Subang Jaya, Aunty Geetha, uses rice water every Monday and Friday on her pegaga patch. “It’s something my late mother did in Seremban,” she shared. “Now my ulam looks like it went to a spa — lush, plump, and thriving!”
📸 Share Your Garden Hack!
Do you have a generational garden secret? A fertiliser trick from your kampung days? Share it and tag @projectharvest.my — we want to feature YOU in our upcoming “From Nenek With Love” series!
Hashtags:#ProjectHarvestMY #RiceWaterHack #GardenFromKitchen #MalaysiaGardenTips
🌈 Final Thoughts: A Little Goes a Long Way
Rice water isn’t a miracle fertiliser — but it’s a simple, zero-cost, beginner-friendly way to gently boost your plants. Think of it as the “vitamin drink” of your garden — not a main meal, but a great supplement.
Give it a try, track your results, and let your plants sip on something special. After all, if it’s good for your rice cooker… it just might be good for your basil too 😉🌿