Q.care of canna lillies
my canna has bloomed and the petals are all coming off. will it continue to bloom again thru-out the summer? what do i do to help it do better? it is in a container

You can trim the spent flowers throughout the blooming period. It may increase the number of flowers and help prolong the flowering.
Here are some links with more information.
https://www.gardeningknowhow.com/ornamental/bulbs/canna/storing-canna-bulbs.htm
https://www.gardeningknowhow.com/ornamental/bulbs/canna/canna-lily-care.htm
https://www.ehow.com/how_5636976_deadhead-canna.html