Photo: ronstik via Adobe Stock We may earn revenue from the products available on this page and participate in affiliate programs. Learn More › Home Advice You Can Trust Tips, tricks & ideas for a better home and yard, delivered to your inbox daily. When spring warmth and moisture kick in each May, gardeners are ready to plant as soon as their last frost dates allow; many green thumbs look forward to Mother’s Day as the day they get their transplants into the ground. If you’re wondering what to plant in May and live in a zone in which you’re just now starting to plant, the key is to avoid species that require a long head start. Lisianthuses, for example, take 140 to 150 days to progress from seed to bloom, so they need to be sown indoors in late winter. Zinnias, on the other hand, often bloom within 75 days, making them terrific flowers to direct-sow in May. You also can expedite growth by starting some flower species from bulbs rather than seeds.…