Spikes are an awesome accent plant that can be saved from year to year. I dig them out before frost, put them in a bucket of water and keep them in a cool dark corner in the basement. After that they only need a little more water as the levels drop...simple and worth the money you save replacing them in the spring.
Spikes grow in full sun or shade which makes it a versatile plant for the ground or in container planting. They enjoy having there feet wet, so a good drink of water daily is in order. Fertilize weekly with a good 20-20-20 blend will also make a spike very happy.
Spikes can be set outside when the temps are 60 degrees during the day. I set mine in my unheated green house and keep them there over night without any problems. I can usually replant them by the end of May here in Wisconsin.
The spikes stay green in the basement and may have a few brown leaves on the bottom of the plant that can be pulled off before planting in the spring.
I use spikes as a showy accent around my pond