They mean here is a heart that is the colour _____. They don't have meaning. I use all the coloured hearts when I'm sending super gay messages to my super gay friends. We send each other rainbow heart messages whenever we're talking about gay shit.
Calendula is a plant. The flower is used to make medicine. Calendula flower is used to prevent muscle spasms, start menstrual periods, and reduce fever. It is also used for treating sore throat and mouth, menstrual cramps, cancer, and stomach and duodenal ulcers. Early research suggests that applying a specific gel (Estromineral Gel, Rottapharm-Madaus) that contains calendula, Lactobacillus sporogenes, isoflavones, and lactic acid to the vagina for 4 weeks reduces symptoms of vaginal atrophy such as vaginal itching, burning, dryness, and pain during intercourse. 2  Leg ulcers.
No although they are both from the Asteraceae family--which includes many plant species-- they are different species of plant. Calendula is often called pot marigold because the flower resembles the marigold flower minus the musky scent.It is also a medicinal plant and a salve made from it's flowers is good for scrapes and burns. Marigold has no medicinal value, but it is very good at keeping some bugs out of other plants.t includes the popular Pot Marigold, Calendula officinalis. But 'marigold' is a word also applied to species of Tagetes and includes the well-known African Marigolds.