March is officially the beginning of spring, but can be really cold with unpredictable weather. Frosts, hailstones, even snow is not uncommon in March and even as the soil begins to warm up, it’s better to be patient before sowing anything outside.
Bush varieties of tomatoes are great for tubs and hanging baskets. Try ‘Hundreds and Thousands’, ‘Tumbler’ or ‘Tumbling Tom’ Red or Yellow. Now is a good time to sow peas and beans. You could also start some cut and come again salad leaves indoors and sow some directly outside as well if the weather is pleasant.