Yardlong Beans are fairly easy to grow, as long as you provide them with sun and space needed to grow.

Water Needs

Low

Yardlong Bean are grown under both irrigated and non-irrigated regimes. The crop responds positively to irrigation but will also produce well under dryland conditions.

Yardlong Bean is more drought resistant than the common bean. Drought resistance is one reason that the Cowpea is such an important crop in many underdeveloped parts of the world. If irrigation is used, more vegetative growth and some delay in maturity may result. Application rates should insure that the crop is not over-watered, especially in Northern latitudes, as this will suppress growth by lowering soil temperatures. The most critical moisture requiring period is just prior to and during bloom.

Fertilizer Needs

Light

Yardlong Beans, like all legumes, forms a symbiotic relationship with a specific soil bacterium (Rhizobium spp.). Rhizobium makes atmospheric nitrogen available to the plant by a process called nitrogen fixation. Fixation occurs in root nodules of the plant and the bacteria utilize sugars produced by the plant. Although Rhizobium is normally widespread, seed inoculation with Rhizobium specific to the Yardlong Beans would be beneficial in areas where it is not present. Always use Rhizobium of the Yardlong Bean type.

Watering, after sowing

Water, 1 inch(es), after sowing, 1 time a week

Keep the soil evenly moist, but don’t over-water. Try and avoid wetting the leaves when watering, as mildew and fungus diseases can be spread in this way. Using drip or a soaker hose is the best way to do this.

The most critical need for water is when they are flowering and sizing up their pods. A lack of water in hot weather can reduce the number of pods, so make sure they are well watered at this time.

Watering also depends on your local weather; don't water if it's raining, or water more frequently if it's dry. Just be sure to keep soil moist for the best crop. The best way to know how much moisture is in your soil is to feel 2" below the soil line. If it's dry, water.

Weeding, after sowing

after sowing, every 2 weeks

The young plants can’t compete very well, so it’s important to keep down weeds initially (a mulch helps a lot). The earlier you weed, the easier it will be. Weeds are quite shallow rooted so it's best to pull weeds by hand, rather than using a hoe. Once the plants get going they can outcompete any weeds.

Weed regularly to keep on top of the task—ideally every 10 to 14 days. Get into the habit of weeding for a few minutes whenever you are in the garden. Remove the biggest weeds first, as these are closest to setting seed.

Support

At planting

Yardlong Beans often reach more than 10 feet or more in height so they need a sturdy support. This should be put in place at the same time as planting, so you don't damage the young growing seedlings.

A traditional support is the bean tepee. Arrange this so the poles splay out a long way at the top. This ensures the growing tips of the plants don't get too congested.