I have just erected a greenhouse. Should I plant bedding seeds in the greenhouse now for spring ?
You could sow some seeds of hardy annuals such as pot marigold and California poppy for planting out in April to flower in June/July.
Seeds of summer bedding such as petunias and begonias needs additional warmth of a small propagator or heat mat to sprout the seeds and the seedlings can be then grown in a greenhouse. These seeds are not sown until February and March.