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.
Calendula has been on my radar for about a week now and I am so happy to hear more good things about it. Now just have to find the seeds. Looking forward to your salve recipe later. Calendula is a favorite of ours, both in the garden for its pretty color and in my skin salves. Have grown it for years. Back east the plants would get quite tall. Here in the high desert they stay squat regardless of soil condition, water, etc.