Stronger Growth. Higher Yields. Better Pasture Performance
NZ–made biostimulants powered by unique plant technology to boost productivity & resilience.
Proven in New Zealand Conditions
Key Results:
Proven Performance in horticulture and livestock production
$5,000+/ha increased OGR in green kiwifruit
30% higher apple yields + high colour
80%+ more pasture growth
8.5% more autumn milk solids
31% more goat milk production
24% less urea excretion in dairy cows
For farmers and growers who think for themselves.
Zest Biotech is for growers and farmers who want solutions that actually work.
Whether you farm organically, biologically, regeneratively, or conventionally, our products are designed to deliver real results in the field.
From horticulture and viticulture to pasture-based livestock systems, productivity depends on reliable inputs you can trust season after season.
Unlike many suppliers, we manufacture our products right here in New Zealand. That means when you have a question, you’ll get a straight answer from the people who make the product.
Our sprays are certified organic and ACVM exempt, making them safe to use on kiwifruit, grapes, pasture, flowers and more.
And because performance matters, our products are backed by our money-back guarantee.
Backed by science. Proven on farms. Trusted by independent growers for over 15 years.
Phenylpropanoid Elicitors: The Zest Difference
Our elicitors work by switching on the plant’s own defence and repair systems
– not by feeding extra nutrients or acting like a pesticide or hormone.
Our range of biostimulants improve crop and pasture performance. Our products are safe to handle and apply. ACVM exempt and Certified Organic by BioGro, there is a Zest product for all crops and farm types.
Scientifically formulated to trigger plant responses and increase the production of bioactive compounds. There is no product 'just like' Agrizest or 'just like' Biozest. Our technology is unique.
Plants have powerful in-built defences
All plants – pasture, kiwifruit, grapes, maize, brassicas, gerberas, strawberries, blueberries… naturally make a family of compounds called phenylpropanoids.
These compounds are part of the plant’s own biology and are involved in a huge range of processes including:
Strengthening cell walls (lignin)
Colour, flavour and aroma (anthocyanins and other flavonoids)
Protecting and repairing damage caused by pest, disease and environmental stress.
Nothing here is genetically modified or artificial – it’s how plants are designed to function.
What Makes Zest Products Unique?
Our products are elicitors of the phenylpropanoid pathway.
They don’t change the plant’s genes or add new traits. Instead, they nudge an existing, natural growth and defence system to work harder at the right time.
You can think of them as a “switch” or “starter signal” the plant receives before things get tough:
The elicitor is recognised by receptors on the leaf surface – like a key fitting a lock.
This early signal tells the plant to get ready and build its own defences.
The plant responds by turning up the phenylpropanoid pathway - strengthening its natural repair growth and defence system.
Because this is a natural pathway the plant already uses, we’re not forcing anything unnatural – we’re helping the plant do more of what it is built to do.
Healthier plants, resilient pasture, better quality and higher returns
Our elicitors deliver this by priming plants before stress hits, so they’re ready with their own protective compounds. On farm, you’ll see:
For livestock farmers
Denser pasture that stays productive through dry spells, wet winters and cold snaps
More palatable pasture that livestock convert better into milk and meat
More milk and meat, less waste, high ROI
For growers and orchardists
Stronger canes and canopies that hold up under wind, heat, frost and disease pressure
Fruit with better colour, firmness, flavour and shelf life – fewer rejects, better storage
More consistent, high quality and yield, season after season
The Zest Difference
Zest Biotech’s elicitors use original NZ‑developed phenylpropanoid technology – not repackaged fertilisers or generic biostimulants, no GMOs, no hormones.
Developed, Tested and Proven Locally, Easy to Use
Developed for Kiwi conditions, they’ve delivered 15+ years of results in pasture, kiwifruit, vineyards, flowers, avocados and more.
Fits Your Existing System
Growers: Slot into spray programmes; tank‑mix with common sprays; BioGro/SWNZ approved.
Farmers: tractor/helicopter/drone application; no grazing withhold; works with any pasture type.
Research
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Kiwifruit Trial Summary 1
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Kiwifruit Trial Summary 2
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Biozest Baleage Trials
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Apple Trials
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Biozest Trials
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Kiwifruit Case Study 1
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Vineyard Trials
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Research Directory
Our Products
We have a plant-elicitor biostimulant for every crop - tree and vine crops, annual crops, pasture and home gardens.
Our products are safe and easy to apply, can be mixed with most common orchard/farm sprays and are BioGro certified for use on organic crops.
Chose from our range below:
For Tree and Vine Crops
Agrizest
Agrizest is an elicitor of the phenylpropanoid pathway for plant health and orchard gate returns. For all tree and vine crops.
Kiwifruit
Grapes
Apples
Other Tree Crops
For Pasture
Biozest
Biozest is scientifically proven to improve pasture growth and quality, to increase milk & meat production and reduce impact.
Dairy Pasture
Sheep Pasture
Beef Pasture
Baleage Production
For Annual Crops & Early Growth Kiwifruit
Primazest
Primazest is formulated for early season kiwifruit growth and grafts and to improve quality & yield in annual crops and floriculture.
Early Growth Kiwifruit
New Grafts
Flower Production
Annual Crops
For Home Gardens
Naturezest
Naturezest helps home gardeners grow healthy, resilient gardens full of flavourful fruit and vegetables and bright, long lasting flowers.
Home Gardens
Fruit Trees
Vegetable Gardens
Houseplants
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