I expanded my garden, and since I have no hard and fast plans for it, so I am going to plant by the phenology calendar this year!
I think this is most useful in the early planting season, when you are unsure of when the last frost will hit. As with everything in nature, these are not hard and fast rules, Mother Nature is a willful creature and will do as she pleases!
When the crocus and forsythia bloom, prune your roses and plant the peas
When the lilac first leafs out, plant your beets, carrots lettuce and spinach
When the lilacs are in full bloom, plant beans, cucumbers and squash
Plant tomatoes when the lily of the valley blooms
Transplant eggplant, melons and peppers when the bearded iris blooms