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 Grow Together $20.00 If Fences Were Flowers $20.00 Once in a while, I dig in my heels $20.00 I Only Have Irises for You $20.00