April is your garden's make-or-break month—with soil warming and frost risk dropping, it's time to shift from planning into action by sowing tender crops, hardening off seedlings, and planting out frost-hardy brassicas while battling the season's first slug invasion. Timing is everything: check your local last frost date, use a soil thermometer before sowing, and gradually acclimate indoor seedlings to outdoor conditions to avoid losing your hard work to shock or cold.