When a person spends a lot of time making sure they have a back up relationship so if their current relationship fails, they have another to fall back on. Which is accomplished by being extremely friendly/borderline flirting. Also know as "Planting Seeds".
This concept was derived from the saying that love blossoms into a flower.
Person 1: Did you hear about Bob's relationship?
Person 2: Yea I heard he's going through a rough patch.
Person 3: It's okay cause he was gardening
all over the place, he'll find another girl easy.