... when
... hearts are bleeding;
[These are the first of the bleeding hearts to bloom and it's a volunteer growing in the path no less.]
... when
... hosta leaves unfurl;
... when
... there's a red tinge on the trees;
...when
... snow peas have broken the soil;
...when
... lettuce is green;
...when
...spinach two leaves appear;
...when
...blueberries bud;
...when
...eggs appear in the pond;
...when
... I spot the first dandelion;
...when
...multiflora rose in the woods turns green; and
... when
...the hummingbird migration map shows that the hummers have been here and moved on.