Ok, time to panic. I'm planting out my cauliflowers, cabbages and broccoli tomorrow and just realised I have no brassica collars. I have no old carpet or vinyl to use. Is there anything else I can use that I might find around the house, perhaps sheets of newspaper or something similar. And how big (diameter) do they need to be and should they fit closely to the stem or do I need to allow some room for growth.