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Deadheading means trimming off blooms when they first begin to fade. For rosette salvia, the flowers will usually fade towards the middle of the summer and begin dropping seeds. Plan on removing any flowers as soon as they begin turning to a dull green or brown color.  Trimming the flowers causes the salvia to bloom a second time. Normal salvia blooms are colorful, so you can easily see when bright blue or violet flowers begin fading. Examine the highest pair of leaves on the salvia stems. You should see 2 small buds emerging for the leaves. Using a sharp pair of shears, trim the stem right above the leaves and buds. These buds branch off into secondary flower spikes.  Rosette-type salvia plants grow stems out of a circle of leaves close to the ground. Tall flower spikes form on these stems. Rosette salvia plants include Woodland Sage, Caradonna, and May Night Sage. The second round of buds will fade by the end of fall. Prepare the salvia for winter by locating the basal foliage, which is the circular cluster of leaves on the ground. The salvia’s flower stalks grow out of it. Snip all of the remaining stems right above these leaves.  After trimming the stalks, only the leaves and possibly a small amount of stalk should remain. Be sure to take out any dead plant material you notice, since it can prevent light from reaching the bottom of the plant. Rosette salvia plants are hardy, but pruning can leave them exposed to cold temperatures. You can protect them by spreading an organic compost, followed by an organic mulch like pine bark. Spread these products as far as the pruned salvia reaches, but avoid letting it touch the plant’s stem.  You can also cover the plant with fleece or leaf-filled garbage bags and a tarp. Weigh these items down to keep them in place. The first frost happens around fall when the temperatures drop below 32 °F (0 °C).
Deadhead the flowers when they fade in summer. Cut the stems down to the new buds. Cut the stems to the ground in fall. Insulate the plant if winter temperatures drop below 20 °F (−7 °C).