Rock's Heart colour need to be red before you give him the blue feather.
You can Purchase a Blue Feather From Karen's Shop after you have reached an Orange heart Level with your Lover
Well you need 60 sprites plus save the harvest goddess so you need to have all the heart events the house upgrade and the big bed in order to get the blue feather to ask the girl you lovee..Hope i could kindah help
you might have to find the harvest sprite called baby. in the pot next to the harvest tree.
You will need to rescue 60 Harvest Sprites to marry any of the marriageable girls and rescue the Harvest Goddess. But first, you will need to have seen all of her Heart Events and have her heart color at red and have the Big Bed (bought from the TV shopping channel) before you show her your Blue Feather to propose. (Blue Feather is 1,000 G from the supermarket once she is at Orange heart color) Hope I could help (:
One week after you give your girl the blue feather. You get the blue feather after taking a girl to orange heart level.
you must have 60 harvest sprites, have a have a girl at a red heart color and get a blue feather at the supermarket for 1000 (don't drop it)
The Feather will become available for purchase at Karen's store once you have a woman up to an Orange (50,000 LP) heart level.
you just give her a flower or something nice everyday until her heart levels change colour. once it reaches red you can give her a blue feather or whatever is used to get married with.
Show them a Blue Feather. (Blue Feather is obtained differently for different games. Example: Raising a character's heart level to it's highest then buying feather from a market) ; )
you give him items until you get an orange heart when u get the orange heart you can then get the clue feather (buy it from supermarket) and when gray has a full red heart give him the feather and he will marry you same with everyone else
You propose to him using the Blue Feather. You can buy the Blue Feather from Karen's Supermarket once any marriage candidate has an Orange Heart. But he will not accept your Blue Feather until you complete all the marriage requirements. Which are: Upgrade your house twice Buy the double bed Have a Red Heart with the guy See all of his Heart Events Rescue at least 60 Harvest Sprites
You can Purchase a Blue Feather from Karens Shop once you have a LP total with one girl/boy of atleast 50,000 (Orange Heart)