Answer: Spiraea are some of the toughest, easiest shrubs to grow. They perform well in full sun or light shade, tolerate poor soils and little water. You may be treating them too well - fertilizer that's high in nitrogen will produce lots of green growth, often at the expense of blooms. I'd hold off on the fertilizer for a while to encourage bloom. Bridal wreath spiraea such as yours should be pruned after normal bloom time (late spring or early summer). Wood that has bloomed (or attempted to bloom) should be cut to the ground. This will encourage new flowering wood and a few late-season blooms. The combination of pruning and a less-rich diet should get your plants back into bloom. Best wishes with your garden!
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