From the Farmer’s Almanac Nature’s “signs” are different in every region; however, you should still relate to these examples:

• Blooming crocus are your cue to plant radishes, parsnips, and spinach.
• When the forsythia is in bloom, it is safe to plant peas, onion sets, and lettuce.
• Half-hardy vegetables, including beets, carrots, and chard, can be planted when the daffodils blossom.
• Look for dandelions to bloom before planting potatoes. 
• Perennial flowers can be planted when the maple trees begin to leaf out.
• When quince is blossoming, transplant cabbage and broccoli.
• Wait for apple trees to bloom before planting bush beans.
• When the apple blossoms fall, plant pole beans and cucumbers.
• By the time the lilacs are in full bloom, it will be safe to plant tender annual flowers and squashes.
• Transfer tomato transplants to the garden when lily-of-the-valley is in full flower.
• Full-sized maple leaves signal time to plant morning glory seeds.
• Peppers and eggplant can be transplanted when the bearded irisesare blooming.
• When peonies blossom, it is safe to plant heat-loving melons, such as cantaloupe.