Transplant hyacinth bean vines once they put on a mature set of leaves but before them start to produce vining tendrils. Wait until outdoor soil temperatures reach 60 to 65 degrees Fahrenheit before transplanting the vines.
Select a transplant bed suited to the hyacinth bean vines. Choose a sunny or partially shaded site with fertile soil and excellent drainage. Avoid boggy areas since the vines will be stunted if exposed to too much moisture.
Weed the bed and remove any large pieces of debris. Amend the bed with compost if the soil is very sandy or heavy. Work the compost at least 6 inches deep until the soil feels loose and takes on a uniform appearance.
Install a trellis along the northern edge of the bed. Use a teepee-style or fencelike trellis. Make sure it is sturdy enough to hold the vines as the beans become heavier toward the end of the growing season.
Dig a planting hole for each hyacinth bean vine plant using a garden trowel. Make the holes twice the volume of the peat pots. Space the holes nine to 12 inches apart. Fill in the bottom inch of each hole with loosened soil.
Trim off a half-inch from the top of each peat pot using shears. Peel the material off so the top of the soil in each pot is exposed. Settle the peat pots into the prepared holes. Fill in around them with garden soil, then press the soil firm. Add more soil around the base of each plant, if necessary.
Water each hyacinth bean vine to a depth of 3 inches immediately after transplanting them. Run a garden hose on low volume at the base of each plant to water; don't spray water onto the leaves since the excess moisture provides an ideal environment for fungi and bacteria.