Every year I start my garden early by using solar cloches made from 2 liter plastic bottles. These three cloches were planted with seed in the last week of March and first week of April, respectively, with tomato and basil, cucumber and dill, and zucchini in planting Zone 6A, eastern Massachusetts.
The ring of bottles are filled with water to store solar heat during the day and the central bottle has its bottom cut out and pressed into the soil to protect the growing seeds.
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