[charlesModerator]

 Yes but most leaves in winter are created on older plants with established root systems. New seedlings need time and energy (the warmth you give them included) to reach a stage where they can offer worthwhile harvests. So it is best to have sown in September, then pick leaves carefully off these plants all winter. Any extra warmth for existing plants will certainly result in more leaves, but I do emphasise that in mild weather there should be a reasonable number of small new leaves on indoor, unheated plants.

[charlesModerator]

 It sounds like an exciting project and good luck with all your growing.

Some vegetables do best  from being raised as one plant per module or plug – lettuce, endive and calabrese for example. They can be either sown in a seed tray and then pricked out as one seedling per module, or sown as two seeds per module and then thinned to one, after germination. Which method you use is purely down to individual preference.

It should be clear from my books which vegetables can be grown as mini clumps, from sowing several seeds per module. Beetroot, onions, spinach and mustards all work well like this.

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