Scarlet Sage is a Brazilian plant grown in garden beds and containers, often as an annual. Its tubular flowers form dense spikes, and both the flowers and the outer parts surrounding them are usually red.
Blood sage (Salvia coccinea) has looser spikes with separate, narrow red flowers. This plant usually has denser, showier spikes, with colorful calyces around the flowers.
Why they get mixed upBoth species are sold and described as scarlet sage.