Lemongrass (serai) is one of the most beloved herbs in Malaysian cooking. Its zesty, citrusy fragrance can elevate soups, curries, marinades — even tea. But when exactly is the best time to harvest it to get the strongest aroma and oil content? Here’s everything you need to know, especially if you’re growing it in a home garden.
Why Harvest Timing Matters
Lemongrass contains volatile essential oils, which are responsible for its aroma and flavour. The concentration of these oils depends on two key things:
- The maturity of the plant
- The time of day you harvest it
A poorly timed harvest can mean weaker flavour and lower oil content.
How to Know When Lemongrass is Ready
Typically, lemongrass is ready for harvesting about 4–6 months after planting. Signs it’s ready:
- Stalks are thick (at least 1 cm)
- Base is white and bulbous
- Leaves have a strong lemon scent when rubbed
- Height is around 3–4 feet
You can either harvest the whole clump or just a few stalks at a time.
Best Time of Day to Harvest
Morning (7am–9am) is ideal. Here’s why:
- The plant’s essential oils are at peak concentration after the cooler night period
- Less water loss from the leaves = more aroma preserved
- It’s more pleasant to work in cooler conditions!
Avoid harvesting during peak heat (12pm–3pm) as the oils may evaporate.
Step-by-Step Guide to Harvesting Lemongrass
Step 1: Use a clean, sharp garden knife or pruner
Step 2: Cut at ground level, just above the root bulb
Step 3: Peel away the tough outer layers and trim off leafy tops
Step 4: Rinse stalks gently and store immediately
How to Store Lemongrass After Harvesting
- Short-term (fridge): Wrap in damp kitchen towel and place in ziplock bag (lasts up to 2 weeks)
- Long-term (freezer): Chop and freeze in airtight container or ziplock (lasts 4–6 months)
- Drying method: Slice thinly and sun-dry or use a dehydrator; store in airtight jar
Pro Tips for Stronger Aroma
- Fertilize every 2–3 weeks with compost or chicken manure
- Avoid harvesting during or just after heavy rain (dilutes oils)
- Always prune brown/dry leaves to redirect energy to stalks
Lemongrass Uses Beyond Cooking
- Mosquito repellents (natural sprays, leaf burn method)
- Lemongrass tea (boil 2–3 stalks with ginger)
- Essential oil extraction (DIY steam distillation)
Frequently Asked Questions
Q: Can I harvest lemongrass all year round in Malaysia?
A: Yes! But it’s best during the dry season when oil concentration is stronger.
Q: Can I replant harvested stalks?
A: Yes — as long as the root is intact, you can propagate new clumps.
Q: How many times can I harvest a plant?
A: If healthy, you can harvest 3–4 times a year for up to 4 years.
Already harvesting your own serai? Snap a photo and tag us on social media — we’d love to share your garden wins!