When to plant Arrowroot in Tropical Australia
Tropical zone — applies to Darwin, Cairns, Townsville, Broome, Mackay and similar areas. Growing elsewhere? Temperate · Cool · Subtropical · Arid.
Plant arrowroot direct at any time of year in the tropics, though the start of the wet season gives the strongest establishment. This is grown from rhizome pieces set deep at 50-100 mm, with new shoots emerging over 21-30 days. Space plants 60-90 cm apart in rows 90-120 cm wide, because arrowroot forms a substantial clump. It is a long-season crop, needing 300-365 days before the starchy rhizomes are ready to lift, so a wet-season planting matures the following dry season. Arrowroot is genuinely at home in the humid warmth of Darwin and Cairns and is one of the most forgiving root crops you can grow here.
Sowing calendar — tropical zone
Green months are your sowing window: January to December.
Growing notes
Arrowroot is a tropical native at heart and asks very little in this climate. It thrives on wet-season rain, tolerates humidity that defeats most crops, and keeps producing usable rhizomes for years once established. Plant the rhizome sections deep, keep water up through the warm months, and it largely looks after itself.
The main failure mode is impatience. This is a 300-365 day crop, and gardeners who dig too early around Townsville and Mackay find thin, watery rhizomes with little of the fine starch arrowroot is prized for. Wait until the foliage yellows and dies back in the dry season before lifting.
- Plant into deep, rich, moisture-retentive soil for the biggest clumps.
- Give it room, at the full 60-90 cm, as it spreads readily.
- Lift in the dry season once top growth has died down.
The other thing to manage is spread. Left in the ground, arrowroot colonises quickly and becomes hard to remove, so site it where a permanent clump is welcome or contain it in a bed you can dig over. Some gardeners grow it partly as a leafy screen or windbreak, harvesting rhizomes as needed. Pests are rarely an issue; the plant's vigour is really the only thing you need to keep in check.
Arrowroot at a glance
| Sowing depth | 50-100 mm |
|---|---|
| Plant spacing | 60-90 cm |
| Row spacing | 90-120 cm |
| Germination | 21-30 days |
| Days to maturity | 300-365 days |
| Frost tolerance | Frost Tender |
| Method | Sow Direct |
Common questions
- When should I plant arrowroot in Darwin?
- You can plant arrowroot at any time in the tropics, but the start of the wet season gives the fastest establishment thanks to reliable warmth and rain. A wet-season planting then matures over the following dry season.
- How long does arrowroot take to harvest?
- It is a long-season crop, around 300-365 days. Wait until the foliage yellows and dies back in the dry season, then lift the rhizomes, as digging early gives thin, starch-poor roots.
- Is arrowroot easy to grow in tropical Queensland?
- Yes, it is one of the most forgiving root crops for the tropics. It loves humidity and wet-season rain, resists most pests, and will keep producing for years once established.
- How do I stop arrowroot from spreading?
- Site it where a permanent clump is welcome, or contain it in a bed you can dig over completely. Left unchecked, it colonises quickly and is difficult to remove from the ground.
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