How to Grow and Care for Yellow Bells (Tecoma stans)

Yellow bells (Tecoma stans) is a fast-growing evergreen shrub with slender, gray-brown branches and clusters of bright yellow, trumpet-shaped flowers, that matures to a height of 25 feet. It's native to the American southwest, from Texas to Arizona.

Green, toothed, lace-shaped leaves offer a beautiful backdrop for the shrub's vibrant blooms, which attract hummingbirds, butterflies, and bees. This perennial produces long, green seedpods after flowering that act as a food source for small animals.

While beautiful and fast-growing, these plants can become invasive.

Yellow Bells Care

Yellow bells is a fairly easy-going shrub, as long as you're in its hardiness range. Here are the main care requirements for yellow bells:

• Choose a location that gets plenty of sunlight; full sun exposure (at least six hours of direct sun per day) will result in the best blooms.
• Plant in nutrient-rich, well-draining soil.
• Allow the soil to dry out between waterings.
• Protect yellow bells from freezing temperatures.
• Possibly supplement yellow bells with fertilizer each spring, though this may not be necessary.

Planting

Plant in well-draining soil in an area that gets lots of sunlight. Dig a hole that's larger than the plant's root ball. Place the plant in the hole, backfill it with more soil, and water thoroughly. The best time to plant yellow bells is in spring.

Light

Plant yellow bells in full sun, though they can be grown in partially shaded areas. However, yellow bells grown in partial shade will not grow as tall or as lush as those that receive six hours of sunlight or more each day.

Soil

Yellow bells are tolerant of many soil conditions, but they do best in rich, slightly moist, well-draining soil. Adding a healthy amount of compost to the soil is an efficient way to ensure adequate draining while providing important nutrients. 

Water

Yellow bells prefer dry to slightly moist soil conditions. As a desert plant, yellow bells are drought-tolerant and can handle dry spells. Be sure not to overwater, as this can lead to rot problems. Natural rainfall is often enough to keep this plant thriving.

In droughts, yellow bells appreciate some supplemental water. You may need to water plants once or twice a month. During extended droughts, weekly watering may be needed.   

Temperature and Humidity

Yellow bells are naturally found in warm climates, such as the Sonoran Desert. They are both heat and cold tolerant but will go dormant in temperatures below freezing. This robust shrub can withstand both droughts and humid climates. 

Fertilizer

In most cases, these plants don't require additional fertilizer. However, if you notice the plant is slow to grow or bloom, add a well-balanced fertilizer once during the growing season. 

Pruning 

Annual pruning can help a yellow bells shrub maintain its shape and encourage new healthy growth. Prune in the late winter after the threat of frost. Use clean, sharp pruning shears.

Remove old growth inner branches and cut the old woody growth back. If there is no green wood growth, cut the shrub to the ground. In most cases, it will re-grow quickly in the spring.

Propagating Yellow Bells

Yellow bells are easily propagated through cuttings taken in the spring or summer. Newly propagated plants may take about two years to bloom. To propagate yellow bells, follow these steps:

1. In the spring or summer, use a sharp knife or pair of garden snips to remove a tip cutting that is several inches long. 
2. Bury the cut end into rich, well-draining soil. Moisten the soil. 
3. Cover the cutting with a plastic bag to keep in moisture. Secure the bag around the pot with a rubber band. 
4. Place the cutting in a warm area with bright, indirect lighting. 
5. Keep the soil moist, but not soggy. 
6. Once there are several inches of new growth, remove the bag and repot into a larger pot, if needed. 
7. Begin hardening off the plant and move it outdoors.  

How to Grow Yellow Bells From Seed

You can also start yellow bells from seeds you've collected from the plant. To grow this plant from seed, follow these steps:

1. Collect seed pods from the plant and wait for them to become brown and dry. Then crack open the pods and remove the seeds. 
2. Fill a small pot with rich, well-draining soil. Peat moss or vermiculite work as well. 
3. Lightly cover the seed in the growing medium. 
4. Water the soil, keeping it moist but not soggy. 
5. Keep the pot in a warm area with bright, indirect lighting. Germination should occur in two to three weeks.  

Potting and Repotting Yellow Bells

Yellow bells have a relatively compact size that allows them to grow well in containers. Choose a well-draining pot at least 12 inches wide or larger, depending on the shrub size. Clay pots are a great choice, as these mimic well-draining soil and wick away excess water.

These plants may outgrow their containers quickly and need repotting. To repot, gently tip the pot onto its side and tap the outside of the pot to loosen the root system. Slide the plant out and set it into a larger pot. Fill it with well-draining soil, burying the shrub to the same height it was before.  

Overwintering

When grown in USDA hardiness zones 10 to 11, yellow bells do not require any additional winter care. When grown outside this area, it is best to keep these shrubs in containers, so they can be moved to a sheltered area in winter, such as a garage or greenhouse.  

How to Get Yellow Bells to Bloom

Yellow bells are known for their bright yellow, trumpet-shaped, lightly fragrant flowers. These reach three to five inches long and appear every year from spring to fall.

These shrubs bloom best in full sun and well-draining soil. Deadhead spent blooms to encourage more blooming and a bushier appearance.

Be sure to give this fast-growing shrub plenty of room to branch out, as they do not like to be cramped or grown in small spaces. High phosphorus fertilizer will also help encourage flowering. 

Common Problems With Yellow Bells

Yellow bells are hardy plants that thrive on neglect. They do not often face issues or problems. However, the biggest problem for yellow bell growers is a lack of blooming.

Lack of Blooming

If this plant is struggling to bloom, it could be for numerous reasons. The most common causes are a lack of adequate light, drainage, or space.

For more light, place yellow bells in an area that gets at least 6 hours of sunlight every day. Replant the shrub, or move the container into a more suitable location. If slow-draining soil conditions are suspected, add sand or another fast-draining material to the soil to allow excess water to drain away.

Yellow Leaves

Yellow leaves can be caused by overwatering. Make sure yellow bells is planted in well-draining soil, and only water once the soil has dried out fully. Nutrient deficiencies can also cause yellowing leaves. If the plant hasn't been fertilized in more than a year or so, consider fertilizing.