Soaking overnight onion peels, washed crushed egg shells, used and washed tea powder, dried and old cow dung cakes, mustard cakes, etc are some instant liquid fertilizer that can be used as foliage spray and poured to soil of flowering plants. Can be given once in twenty days except in very sunny days and some plant’s dormant periods like winter. Potted plants are dependant on us for their nutrition, so study each plant’s nutrition requirement before giving them