Fermented Plant Extract Tonics for Living Soil

An FPE is a liquid concentrate made by fermenting fresh plant material with a sugar source and beneficial microbes such as lactic acid bacteria (LAB) or EM-1. As the microbes break down the plant matter, nutrients, enzymes and other plant compounds become easier for plants and soil biology to use. We ferment ours on the farm at Tamborine Mountain.

All three extract goodness from plants, but they're made differently.

• Comfrey tea is usually steeped in water and left to break down. It works, but the process is uncontrolled and often anaerobic, which is why it smells so strong.
• FPJ, from Korean Natural Farming, ferments plant material with brown sugar and relies on wild microbes.
• Our FPEs use a controlled ferment with EM-1, so every batch is inoculated with a known, beneficial microbial community rather than whatever happens to be present.

No — they work very differently. Standard liquid fertilisers deliver soluble nutrients directly to plants. FPEs feed and stimulate your soil's microbial ecosystem, which in turn unlocks nutrients naturally. FPEs also deliver plant growth hormones, enzymes, and beneficial microbes that fertilisers simply don't contain.

Yes. Our FPEs are living ferments, so they have an earthy, slightly pickled aroma. That's the smell of active lactic acid bacteria, the same kind of beneficial microbes found in yoghurt and sauerkraut. The smell fades quickly once the concentrate is diluted and watered in. A strong rotten or putrid smell is not normal. If you notice one, email us at hello@kaikaifarm.au.

Absolutely. Our FPEs are 100% organic, chemical-free, and non-toxic. They are widely used in organic vegetable gardens, permaculture systems, and natural farming. Apply to soil or as a foliar spray — just maintain the recommended dilution ratios and avoid applying to produce right before harvest.

FPEs work cumulatively, not instantly. Many growers notice improved leaf colour and recovery from stress within 2–4 weeks of regular use. The biggest benefits — improved soil structure, increased resilience, and richer harvests — build over a full season. Unlike synthetic fertilisers, you're building biological wealth, not borrowing against it.

For absolute beginners, our Probiotic Soil Tonic Concentrate or Comfrey Fermented Extract is the ideal starting point — it works on everything. If you want to target a specific outcome, use our product guide above: Seaweed for stressed plants, Pumpkin for fruiting and growth, and Frass for pest resistance.

Yes! FPEs combine beautifully with each other and with other microbial inputs like EM-1 Bokashi liquid or compost teas. Many experienced growers rotate between products — for example, Seaweed one week and Comfrey the next. Just avoid mixing with synthetic chemicals or chlorinated tap water (let it sit 24 hours first).

Because these are concentrated — diluted at 1:500 to 1:1000 — a single litre goes an incredibly long way. One litre makes up to 1,000 litres of ready-to-use tonic. For a typical home garden applying fortnightly, one bottle can last an entire growing season. Store in a cool, dark place and use within 12 months of opening.

Yes. Our FPEs are 100% non-toxic and chemical-free. They are safe for pets, children, bees, butterflies, earthworms, and all beneficial garden life. We do advise to not spray the Aloe Vera around pets as it can be toxic to animals.  We use the same products on our own farm at Tamborine Mountain where our family and animals live and work daily.

EM-1 (Effective Microorganisms) is a consortium of beneficial microbes — Lactic Acid Bacteria, yeasts, and phototrophic bacteria — developed by Japanese microbiologist Dr Teruo Higa. We use it as both a fermentation catalyst and a soil probiotic. It drives the fermentation of our plant extracts AND inoculates your soil with biology that improves structure, nutrient cycling, and long-term fertility.