Grow a Friend $20.00 Inside Message Inside: You Will Bloom Packages of Heartstrings® cards are shrink-wrapped and sold in sets of 10 cards with envelopes. The actual card size is 4 1/4" x 5 1/2". Grow a Friend quantity Add to cart SKU: 718. Categories: Friendship & Support, Gardening. Related Products We Sing in Circles $20.00 Where the Heart Goes, Flowers Grow $20.00 Paws in the Flowers $20.00 Give Peas a Chance $20.00