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Caring for cardinal flowers
Water your growing cardinal flowers deeply in the absence of rain.
Fertilize the plants in fall with a shovelful of compost for each plant or a general purpose fertilizer. Cardinal flowers begin blooming in early summer and peak in mid- to late summer. Clip out the flower stems when they are done blooming, or leave them in place if you want the plants to self-sow.
(“gardeningknowhow.”)