Binding in the Lulav

When should I bind the lulav, meaning on the eve of Sukkot I prepare the holder, place the myrtles and willows inside, tie it, and then remove it and place it in the refrigerator to keep it fresh. In the morning, I insert the holder back. Is this okay? Is there a lack in binding? Is there building or tying on Yom Tov? What should I do? Thank you.

Hello Rabbi

It is permitted to insert the lulav into the binding on Yom Tov.

Mishnah Berurah, Siman 651, S"K 8
And see in the response of Agurah BaOhelach, where it is discussed that the custom of not making a knot but making a handle from lulav leaves and inserting the lulav into it is also considered a knot, see there.

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