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IrriGarden plug. You can see it has a hardy root system and the foliage is excellent as well. These plugs are UV stable and will last for many years. Considering the ever increasing UV intensity our world is being exposed to it makes good sense to use these for growing any new plants.
This is important for all of us. Presently the majority of plastics involved in horticulture and agriculture are use once terminal, the plastic life then joins a waste stream that is passed on to the customer and then to the environment, commonly ending up in landfills at best or open sea. These plugs & tray kits are top gear. Thousands of plant varieties from all their habitats, arboreal, terrestrial or aquatic can be effectively reproduced using it. I can vouch for this personally. Ultraviolet radiation has increased by as much as 30% in the last few decades and it is not declining. The plastic in these trays and plugs will provide service for decades in the Sun. We encourage the use of longterm hardware when practical and this is an excellent representation of practical.
This product has earned an excellent track record for many decades and is designed specifically for reusable plant culture cycling. A reliable green choice, hands down.

Storage is simple. When not in use they can be stored as seen in the picture above. Trays will stack on top of each other. They can be cleaned with a 10% solution of bleach in case of disease. White vinegar, Salt or backing soda solutions work well too. Your choice.