Once you have had a successful lotus season, and by this, I mean growing your lotus from tubers and having them flower throughout the summer season, you will want to know how to over winter your lotus. Once cooler weather has arrived, it is time for you to begin to ready your lotus for winter. Lotus are hardy and go dormant in cooler weather with less sunlight. If your pond does not freeze solid, your lotus will go dormant and will be fine left where they are. If you are in a more moderate climate,your lotus will also go dormant and you can leave your lotus where they are, making sure to keep water in their container over the winter months. If you wish to bring your lotus indoors to overwinter, just drain the water from the container, careful not to disturb the tubers, and allow to sit dormant in dry conditions over the winter in the coolest part of your basement or garage.
To overwinter, wait until lotus leaves are shriveled and stems are brown, begin this process by removing all spent flowers and seed heads from your lotus plants and cut the stems down to about 10" above the water. The reason for this is that the lotus stems are hollow and if you should cut down the stems beneath the water level, you will drown the plant. (If you have smaller lotus, leave about 5" of the stem above the water)
Your lotus will survive the winter with no problem and begin growing again in the spring when the weather and water warm up again. New tubers will send up new plants and you may eventually have to divide your lotus.
If you would like to harvest your tubers and store them indoors over the winter, start by gently turning your lotus pot upside down and hose off the roots and tubers until the soil is washed away. Sort through the roots and tubers and choose tubers with at least two growing tips. Mix one gallon of water with one tablespoon of bleach and soak the new tubers for about an hour. Remove from bleach water and store cool and dry. Lotus tubers can be stored in the crisper of your refrigerator.