When learning how to plant cattails, there are a couple of things to remember.
You will need to know what size area you would like to cover with the cattails and how high you would like them to grow.
Cattails come in a variety of species and also grow to different heights. It is best to research cattails and determine which will work best for you. Some cattails will grow to be only around 3 feet high, and others will grow to 9 feet high. The taller ones are great to plant around ponds, lakes, or large bodies of water. If you are looking for an ornamental plant for a flower pot or container, the 3-foot ones will probably work fine. You will be able to use these also in flower arrangements for your home. When planting cattails, it is best to find a spot that will be very moist all year round. You may be planting your cattails from seeds. Make sure that your seeds a clean. You will need to clear the area of all grass and weeds. You will need to plant your seeds in early fall. Plant your seeds about ¼ to ½ inch deep into the cleared soil area. Your cattail seeds will begin coming up in early summer. You will need to keep the grass and weeds out of the area where you have planted your cattail seeds.
Source of Information on Cattails
https://www.tnnursery.net