I recommend always germinating and early growing in either root trainers or some kitchen roll holders (loo roll holders are a bit short) and then they can grow quite happily until the weather is perfect for transplanting. This is particularly important if you live in northern climes as a week can make a great difference and it is infuriating if you require to transplant as the roots are coming out of the bottom of your module or loo roll holder!

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Aerodynamically the bumblebee shouldn't be able to fly, but the bumblebee doesn't know that so it goes on flying anyway.
~ Mary Kay Ash