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Pinch off the purple-floweredPinch off the purple-flowered stalks at their base. It's been warm for basil and it's going into "reproductive mode" and stopping growth. If your basil plants don't keep growing, try cutting them in half (make some pesto) and it should grow back with renewed energy. Since you have so many plants, perhaps you do an experiment this year and do half and half!

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?