Kava — 'awa in Hawaiian — is one of the most rewarding plants to grow on the Big Island, but it's also one of the fussiest about its root zone in the first year. Get the soil right early, and the rest of the plant's life is easy. Get it wrong, and you'll fight root rot, stunted growth, or dried-out keiki for months.
Here's the soil mix we recommend at HVO Farm for kava plants under one year old, using our volcanic top soil and black cinder blend.
What Young Kava Actually Wants
Kava thrives in rich, loose, moist, well-drained volcanic soil with plenty of aeration and organic matter. The Association for Hawaiian Awa and most experienced kava growers agree on this point: young kava wants something loamy, cushioned, and well-oxygenated. Think of it as a halfway point between a nursery potting mix and an in-ground bed.
Unlike bananas — which can handle a coarse, cindery mix (see our banana soil guide) — young kava needs more fine, organic-rich material around the root zone.
Our straight HVO Top Soil brings the organic richness (29.3% OM, pH 5.47), and the Black Cinder 50/50 blend delivers the air pockets and drainage kava roots need to stay disease-free.
The Kava Soil Mix Recipe (Standard Nursery Beds & In-Ground)
For young kava planted at typical Big Island elevations:
- 40% HVO Top Soil with Black Cinder 50/50 — for drainage and aeration
- 60% Straight HVO Top Soil — for organic matter and moisture retention
Ordering by the yard: For 1 cubic yard of kava mix → 0.4 yd Top Soil + Black Cinder + 0.6 yd pure Top Soil.
Container Kava or Very Wet Sites? Tighten the Drainage
If you're potting kava up or planting in a soggy, low-lying area, lean a little harder on the cinder:
- 50% Top Soil + Black Cinder
- 50% Pure Top Soil
Optional: The Premium Kava Mix
If you're running a kava nursery or want a higher-end blend for a few prized plants, fold in 10–20% high-quality compost by volume on top of the base mix above. This pushes organic matter even higher and gives nursery keiki a faster start. The University of Hawaii's traditional Hawaiian medicinal plants research has noted that rich, organic-loaded volcanic soil produces the highest-quality kavalactone yields.
Most established kava grower guides recommend roughly 75% rich topsoil to 25% cinder or perlite — and our 40/60 to 50/50 ratios land right in that zone.
Quick Order Summary for Young Kava
| Planting situation | Top Soil + Black Cinder | Pure Top Soil |
|---|---|---|
| Standard nursery / in-ground | 40% | 60% |
| Containers or wet spots | 50% | 50% |
| Premium nursery (add compost) | 40% | 60% + 10–20% compost |
Big Island kava growers — order your soil by the yard from HVO Farm.
🌱 Related Grow Guides:
📞 Call Rick: 808-425-0474 (Hawaiian Time Zone)
Happy growing, The HVO Farm Team