If it per chance stops blooming before summer’s end, cut it back by 1/3 to 1/2 it will take off flowering anew. The persistence of its flowering is one of its great assets, no matter how late it begins.
Plant in a location that enjoys full sun and remember to apply water fairly sparingly. Keep in mind when planting that Black and Blue is thought of as tender, so remember to wait until your soil is warm and the night time temperature is well above freezing before moving outside. Black and Blue needs a loamy soil with a ph of 6.0 to 7.5 (weakly acidic soil to weakly alkaline soil).Spreading rhizomitously, over time the clump can spread to three feet wide. Large clumps can be divided in spring before new leaves begin to appear, or in the fall after the blooms have faded. Starts can be made from softwood cuttings in spring (in warmer zones), or ripening summer cuttings, or from terminal cuttings from any month it is growing.
By our calculations, you should look at sowing Black and Blue about 84 days before your last frost date.
Give plenty of water when transplanting. In time will become drought tolerant.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Black and Blue is a tender plant.Blue Anise Sage, Brazillian Blue Sage, Sapphire Sage, Anise Scented Sage