Here’s what you should know:

Use a Potassium-Rich Fertilizer:
In autumn, switch from nitrogen-heavy fertilizers to ones rich in potassium (K) and phosphorus (P). These nutrients strengthen the plants, support root development, and improve winter hardiness.

Avoid Nitrogen:
Stop using nitrogen fertilizers after midsummer. Too much nitrogen in fall can cause tender new growth, which may not survive the winter.

Organic Options:
You can also use natural fertilizers like wood ash (for potassium) or well-composted manure – just make sure it's suitable for acid-loving plants like blueberries.

Mulch for Protection:
After fertilizing, add a thick layer of acidic mulch like pine bark or pine needles. This helps maintain soil acidity and protects the roots from freezing temperatures.

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Good luck with your blueberries!