NZ: Biodegradable nursery pots to offer plastic-free alternative

A new product developed with help from the Ministry for Primary Industries (MPI) will offer an alternative to the estimated 350 million plastic trays and pots used by New Zealand nurseries and gardeners each year. 

“We’ve supported Pinehurst Associates Ltd to develop a proof of concept for biodegradable garden pots,” says Steve Penno, MPI’s director of investment programs. 

“The pots can last 12 months above ground before biodegrading, with the biodegrading process starting as soon as the soil is added. They can be planted directly into the ground, with the pot providing fertilizer for the plant as the pot biodegrades. 


Photo by Wilson and Ross

“Taking commonly used plastic pots out of landfills will also help the environment.”  

MPI contributed more than $41,000 to the project through the Sustainable Food and Fibre Futures fund. This has enabled Pinehurst Associates to refine its research and development and work through manufacturing issues. 

Bio-polymers
Peter Wilson, director of Pinehurst Associates, says the new product, PolBionix, is made from bio-polymers and a bio-filler. The bio-polymers are made from sustainably grown sugarcane, cassava, and corn. The bio-filler is from waste organic matter that contains naturally occurring chemicals and nutrients that are attractive to microbes to eat.  

“As a result, PolBionix biodegrades in mild environments, like in soil and under home composting conditions,” Mr. Wilson says. The product is currently being tested in 3 commercial nurseries. “The advantage of our product over other biodegradable pots in the market is its long shelf life,” Mr. Wilson says.  

“Our product can withstand the regular watering and handling that takes place in commercial nurseries.” 

Mr. Wilson says the pots can be manufactured using existing plastic injection mold manufacturing processes. The product can also be manufactured with thermoforming and film-blown processes.  

Price difference
“Raw material costs for PolBionix are higher than for traditional fossil-based plastic pots, so the PolBionix pots will be more expensive. However, once you factor in not having to add fertilizer and costs saved from not having to then dispose of the traditional pots – such as reduced labor, landfill, and environmental costs – I think our PolBionix pots are a clear winner.”   

Auckland Council trialed the planting of PolBionixpots in Waitawa Regional Park on 3 August. Further PolBionix pots were planted at a local Auckland school this month. The school’s pot planting is being supported by Auckland Transport’s Eastern Busway project team, who have a keen focus on environmental sustainability and using less plastic. 

Mr. Wilson says that PolBionixis the result of 4 years of research in collaboration with Crown research institute Scion and funding support from Callaghan Innovation and Auckland Council’s Waste Minimisation Fund.  

“The scientific breakthrough that Scion’s scientists achieved has resulted in the filing of 2 international patents. The potential for the development of additional products that help mitigate the damage fossil-based plastic does to the environment is exciting,” Mr. Wilson says. 

Steve Penno says the project aligns with the sustainability goal of the Government and the food and fiber sector’s Fit for a Better World roadmap. “This sustainable solution has the potential to make a difference globally – not just in New Zealand. While the pots may cost a bit more financially, they won’t cost the earth.” 

Pinehurst Associates has received $85,500 from the Ministry for the Environment’s Plastics Innovation Fund, announced by Minister David Parker on Friday, 23 September. This will assist the company in continuing to research additional formulations and fast-track the commercialization of the PolBionix pots. 

PolBionix will be commercialized through Wilson and Ross Limited within the next year.

For more information:
Wilson & Ross
www.wilsonandross.com 


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