strophanthus in homoeopathic dose 6 DH (6 drops to be taken once a day at evening or twice a day in the case of heart disturbances)
"One could cite an entire list of plants from antiquity that were prescribed for projecting the energy of the heart for external reactions. But aside from strophanthus, I shall not now name any of them in order to avoid abuse. Not only does strophanthus regulate, it also concentrates, the energy of the heart. Therefore it may be taken without harm and apparent need, every two weeks. One may take six drops in succession for three days—once a day at evening. Of course in the case of heart disturbances it can be taken twice a day."
Heart (Agni Yoga), § 563
flowers and of course roses (it is more common sense than a scientific panacea)