Set the nasturtiums outdoors on a patio or other area protected from intense sunlight and wind. Water the plants as needed to keep the soil moist. Leave the nasturtiums outdoors for five to seven days to acclimate, bringing them inside only if frost threatens.
Incorporate a 2-inch layer of compost into the top 6 to 8 inches of a full-sun garden bed. Choose a bed that provides optimum drainage, as nasturtiums cannot tolerate soggy soil.
Dig a hole that equals the depth of the nasturtium pot. Make the hole two to three times wider than the pot.
Tear the rim off the peat pot so the edge of the pot is level with the soil inside. Peat wicks moisture out of the soil if allowed to stick up above the surrounding soil level.
Set the entire pot in the planting hole. Fill in the hole with the surrounding soil, covering the torn rim of the pot with soil.
Water the nasturtiums thoroughly after transplanting. Keep the soil moist, but not soggy, by irrigating one to two times a week. The pot decomposes into the soil.