Hi HeatherWayles
I follow Charles advice about when to sow seeds etc .
I also use GrowVeg garden planner to help work out how many of any particular vegetable I can grow in the space. https://www.growveg.co.uk/gardenplanner/gardenplanner.html#
You draw out the dimensions of your vegetable garden. You then drag and drop particular vegetables onto the design and stretch the shape depending on how much space you want to use to grow that vegetable. The software then tells you how many plants that would be.
You can edit the spacing if you want to and it gives an idea of harvest dates etc.
There is a small cost to subscribe but I find it very useful.
It also gives you a way of recording notes and printing out for future reference.
I always sow a few extra so I can choose the strongest seedlings. So say I want 2 courgette plants I might sow 4 seeds.If they are all strong then I give spares away to friends who may not have a greenhouse.
Hope that helps
