Chrysanthemums often appear for sale at your local garden center or grocery store long before summer is over. But hold onto your pumpkin spice latte, should you buy these seasonal plants just yet? A favorite for outdoor fall decor, mums burst into bloom just when many other summer-flowering plants like zinnias and petunias start winding down in the cooler autumn weather. That’s why a few potted mums perched on your porch seems like a no-brainer for transitioning from summer into the next season. But don’t be in too much of a hurry if you want your plants to last. Even though retailers start selling mums well before fall begins, you may want to hold off on buying them just yet.