Answer: Plants are amazing and can withstand all kinds of crazy weather, so relax. Your daffodils will slow their growth when the weather is cold and will grow slowly when the weather warms up again. I've had them sprout in December and then just sit there in a state of suspended animation until March when the weather was to their liking. The additional mulch won't stop them from sprouting and the foliage is thick and filled with fluid that acts like an antifreeze so everything should be fine until it's time for them to bloom. Just relax and enjoy your garden - and trust your daffodils. They know what they're doing.
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