A cool shady location. They need some light for best leaf colour but protection from strong sun is important. Pale coloured hostas are the most prone to sunburn.
Well-drained soil, rich in humus. Or good quality potting mix.
Moisture. Summer watering is essential for new plantings. The more sun they get, the more water hostas need. Mulch to keep roots cool and moist.
Fertiliser. Feed potted hostas in spring with controlled-release fertiliser.
Protection from the enemy. Make sure slug and snail protection is in place before spring leaves emerge.