source photo: sophieinthesticks.co.uk
Particularly with cabbages (Brassica for example) the effectivity of Fresh Pod has been demonstrated. Added bonus is that when the product has worn off after about six months, it can be used as fertilizer in the garden.
The product consists of small OMRI balls which can be purchased in bags of 5.8 and 28 gram, which in their turn have to be covered by protective packaging. The natural formula communicates with ethylene and converts it to manganese dioxide (brownstone). This way the product is converted to fertilizer after use, and thus leaves zero waste.