Winstone Gypsum Clay Breaker 8kg
Winstone Gypsum Clay Breaker 8kg
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Dispatched in 2 to 4 business days. Tracked courier delivery anywhere in New Zealand; bulk orders go by freight. Shipping is calculated at checkout.
Winstone Gypsum Clay Breaker 8 kg
Winstone Gypsum Clay Breaker is a bagged natural gypsum (calcium sulphate) for loosening clay and compacted garden soil. It adds calcium and sulphur without changing pH, so it suits vegetables, flowers, fruit trees, lawns and acid loving natives alike. This is the 8 kg bag.
At a glance
- Type: amendment (calcium sulphate, clay breaker)
- Use for: heavy clay, compacted soil, calcium and sulphur without a pH change
- Rate: not printed on this page; follow the rate on the Winstone bag
- Pack: 8 kg bag
- Also available: 25 kg bag
What it is
Clay Breaker is Winstone's gypsum, calcium sulphate dihydrate. Gypsum is 23.3% calcium and 18.6% sulphur; the bag carries Winstone's own typical analysis.
What it does
- Calcium from gypsum helps clay particles bind into crumbs, so heavy and compacted soil opens up, drains better and lets roots go deeper.
- Gypsum is a neutral salt. It does not move pH, which is why it can go on acid loving New Zealand natives and citrus as well as the vegetable garden and lawn.
- Calcium displaces sodium from clay, the standard treatment for sodic soils.
- It also supplies sulphur, which plants use for proteins, oils and flavour compounds.
How to use
- Suitable for vegetables, flowers, shrubs, citrus, fruit trees, large trees including acid loving New Zealand natives, and lawns.
- Apply at any time of year. For best results apply once in spring and again in autumn.
- New beds: dig into the soil before planting.
- Established lawns and trees: spread over the surface and water in well.
- Gypsum does not raise pH. If the soil is acid and calcium is low, lime is the tool, not gypsum.
- Clay with plenty of calcium already will not change much. A soil test tells you which.
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Handling and storage
- Wear a mask to avoid inhaling particles and open the bag in a well ventilated area.
- Wear gloves and eye protection, and wash hands after use.
- Once opened, keep sealed and dry.
Delivery and returns
Delivery and returns
We aim to dispatch within 2 to 4 business days. Bags go by tracked Courier Post (overnight target for main centres, 2 to 3 days rural). Cubes and tonnes go by Mainfreight or Move Logistics: 2 to 3 working days in the South Island, 3 to 7 days to the North Island. A rural delivery fee may apply.
Faulty, damaged or wrong items are repaired, replaced or refunded under the Consumer Guarantees Act, with return costs on us. Change of mind returns are accepted within 30 days of delivery for unopened products in original packaging (living products, bulk orders, testing, consulting and custom blends excluded). See returns and refunds and the FAQ.
Bulk and commercial orders
Bulk and commercial orders
Many products are available in cubes and tonnes, and living soil recipes can be modified to a specification. Email store@seaclifforganics.nz with quantities and delivery address for a price.
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