Mums like a sunny spot with good drainage. If your soil has too much clay, they can rot easily. And make sure you’re buying them for your correct growing Zone and are buying Perennial (sometimes marked as ‘Hardy’) Mums versus the commercially grown ones.
https://www.homefortheharvest.com/perennial-mums/
Easiest way to store Daylily is to put them in a paper sack or a mesh bag with plenty of air circulation; don’t crowd them. Shake off as much dirt as you can, if they’ve been freshly dug. Store the bulbs (usually hung) for winter in a cool, dry location. Humidity is the enemy, so not near a dryer vent or in a wet basement. The ideal temperature is ABOVE freezing but no warmer than 50 degrees.
Thanks