March is when the garden starts to move. Days lengthen quickly, and both seeds and gardeners get busy. The main risk is a late frost after a warm spell. 100% Local
Cool-season crops thrive now: lettuce, carrots and green onions can be sown directly. Start tender crops such as tomatoes and peppers indoors for planting out after the last frost.
In colder zones, wait for the soil to dry before sowing and use cloches. In warmer zones, you can sow more widely and plant potatoes. Wherever you are, do not plant tender crops outside until frost has passed.
In mild areas, yes, once the soil has warmed a little. In colder zones, wait until later in spring and protect early shoots from frost.
A late frost or cold, wet soil is the usual cause. Use fleece or cloches, and harden seedlings off before planting them out.
March is a good month to repot houseplants as growth resumes, and to take cuttings from plants that are actively growing. Move plants closer to brighter windows now that the sun is stronger, but watch for scorch on leaves that have spent winter in dim light. Watering can increase as the mix begins to dry faster.
Move them gradually as the days lengthen. A little more light each week lets the leaves adjust without scorching.
General horticultural guidance for planning only. Verify locally.