Answer: I wish there were some magic potion I could direct you to, but the growth rate of shrubs is dependent upon the shrub's genetic makeup, along with sunshine and summer temperatures. It's true that when you prune a stem two new stems are usually produced, but if you prune your hydrangea and escallonia to make them bushier, you may delay their flowering. Both shrubs are relatively fast growing, providing they get ample water and warm temperatures. I'd just try to coax them along with regular waterings and hope that Mother Nature brings summer weather to your garden.
Best wishes with your wedding!
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