Taro (kalo) growing in Hawaiian volcanic soil on the Big Island

Best Soil for Taro — Using Hawaiian Volcanic Organic Products

Taro (Colocasia esculenta) is one of Hawaii's most sacred and time-honored crops. To grow it successfully, you need soil that is rich in organic matter, biologically active, and moisture-retentive — without becoming waterlogged. The good news? Everything you need is right here at HVO.farm.

The Best Soil Combination for Taro

Start with a strong foundation by blending Organic Top Soil with 1.5" Minus Black Cinder. Our Organic Top Soil is sourced from over 10 feet of deep, fertile Big Island volcanic earth — naturally mineral-rich and ideal for taro's heavy feeding needs. The 1.5" Minus Black Cinder keeps your soil aerated and well-draining while supporting indigenous microorganisms (IMOs) that taro thrives alongside.

Applying Hawaiian Bokashi inoculant to a taro bed for soil microbes

Recommended Soil Amendments

Boost your taro bed with these HVO products:

  • Hawaiian Bokashi Compost Starter: Taro is a heavy feeder that loves rich organic matter. Our Bokashi blend, infused with 34 naturally occurring Hawaiian volcanic minerals, accelerates soil fertility and feeds your crop from the roots up.
  • Hawaiian Bokashi Inoculant™: Apply at 1 lb per cubic yard of soil to populate your beds with beneficial microbes. One 2 lb bag treats approximately 2 cubic yards of soil. Reapply every 2 months to keep the microbial community thriving.
  • Coconut Coir: Mimics the moist riverbank conditions taro naturally loves by retaining consistent moisture while still maintaining drainage.

Ideal Taro Soil Profile

Property

What Taro Needs

HVO Product

Structure

Loamy, aerated

Organic Top Soil + Black Cinder

Drainage

Well-draining but moist

1.5" Minus Black Cinder

Nutrients

Rich organic matter & minerals

Bokashi Compost Starter

Microbiology

Active soil microbes

Hawaiian Bokashi Inoculant™

Moisture Retention

Consistently moist

Coconut Coir
Pro Tip

Taro prefers a slightly acidic soil pH of 5.5–6.5 — a natural match for Hawaii's volcanic soil base. Mix your Organic Top Soil, Black Cinder, and Coconut Coir at a ratio of 2:1:1, then inoculate with Bokashi before planting. You'll be setting your kalo up for a strong, healthy harvest.

👉 Shop all taro soil products at HVO.farm

Taro is one of the oldest cultivated crops in the world, with deep cultural and spiritual roots in Hawaii. Known as kalo, it has been grown across the islands for over 1,500 years and is considered a sacred ancestor in Hawaiian tradition. It thrives in warm, humid conditions with consistent moisture and rich, biologically active soil — making volcanic Big Island earth a natural fit.

Indigenous Microorganisms (IMOs) are beneficial bacteria, fungi, and microbes naturally found in local Hawaiian forest soils. They form a living network that helps plant roots absorb nutrients, breaks down organic matter, and protects crops from disease. IMOs are central to Korean Natural Farming (KNF), an organic growing method widely adopted across Hawaii because the locally adapted microbes thrive immediately in our climate.

Soil pH controls how easily plants can absorb nutrients. Taro specifically prefers slightly acidic conditions because at this range, key nutrients like phosphorus, iron, and magnesium become most bioavailable. Hawaii's volcanic soils naturally fall within this ideal pH range, which is one reason taro has flourished here for centuries without synthetic amendments.

Back to blog

Leave a comment

Please note, comments need to be approved before they are published.