Very sparingly Steve in Baltimore County

Don't put peat moss (the regular peat moss) in the soil for a dahila.
They need very good drainage and peat moss will hold the water and rot the roots.
You are talking about bringing the tubers in the home for winter right? In a pot?
If you put it in the soil outside for your tubers next spring, you can put a little peat moss in the soil. A little.

Peat moss is an excellent soil conditioner and one bag of peat moss would break up clay soil or add organic material to a small (10 x10 foot) garden. It is a bit acidic but that is good if your soil is too alkaline. Most of the expensive potting soils have a peat moss base. They add a surfactant to allow it to take up water quickly and some lime to increase the ph.

I was planting a sunflower in a tire so it couldn't be mowed down. It turns out a whole bag of peat moss was dumped in the tire and some compost. I had help that was in a hurry to leave. It is powdery peat most and it has been under the deck for at least 6 or 8 years. One of the BIG bags. It is just sitting over the ground not enclosed at the bottom. Would it help to add more compost or should I scoop out most of the peat moss and replace it with humus and compost? TIA