Growing green beans on a trellis is an easy way to take advantage of the vertical space in your garden and ensure your bean plants both receive sunlight for growth and fresh air flow to keep diseases down. Even if you're used to bush varieties of green beans, or you've never grown green beans before, using a trellis isn't complicated and can make harvesting green beans simpler and more productive. Green beans have a strong habit that wants to grow; all you have to do is supply the trellis.
Set up your trellis in the area where you want to grow your green beans, preferably running from east to west. Make sure the location is in full sun with well worked, loose soil.
Plant a seed 1 1/2 to 2 inches deep every 4 to 6 inches along one row and cover lightly. If planting more than one row, be sure to space the rows 3 feet apart and supply a different trellis for each row.
Water the soil enough to make it moist--not soaking wet--and keep the soil moist for the first three to four weeks. Look for seeds to germinate and seedlings to begin to grow after about five to seven days.
Train your green bean plants to hold the trellis as soon as you notice the seedlings drooping. Gently weave the stems through the trellis as they grow tall enough to reach each new trellis rung.
Tie a short plant tie around the trellis, catching a stem of the green bean plant in it, to help hold the plant to the trellis.
Harvest the beans as they form on the plant. Most varieties of green bean will continue to produce so long as you continue to collect pods, so regular harvesting should be kept up.