Macadamia nuts have doubled in price from $25 per kilogram to $50 per kilogram as growers struggle to keep up with demand.

The price increase is also due to growers getting paid more and because of the rarity of the product.

Market Development Manager Lynne Ziehlke says there is a clear rise in consumer interest in plant-based food and a lot of this is driven by vegan, coeliacs, and consumers looking for dairy alternatives.