How to Plant Tree Dahlia Tubers in the Ground

Tree dahlias are beautiful, statement plants that can bring a stunning vertical element to any garden. They grow up to 12 feet tall and have striking foliage and colorful blossoms. These plants are grown from tubers, which are similar to bulbs, and they can be planted in the ground in just a few easy steps.

Step 1: Choose a Spot

The first step in planting tree dahlias is to choose a spot that is suitable for them. These plants love full sun but can tolerate light shade, so look for a spot that gets at least 4-6 hours of direct sunlight per day. The soil should be well-draining and fertile, with a pH between 6.0 and 7.5.

Step 2: Prepare the Soil

The next step is to prepare the soil for planting. Start by digging a hole that is twice the width and depth of the tuber. Mix in some compost or well-rotted manure to enrich the soil and improve drainage. Then, add a handful of bone meal or superphosphate to the bottom of the hole to promote root growth.

Step 3: Plant the Tubers

Once the soil is prepared, it's time to plant the tubers. Place the tuber in the hole with the "eyes" (the small, pointed buds) facing up. Cover the tuber with soil and pat it down gently. Water the area well to settle the soil and promote root growth.

Step 4: Add Support

Because tree dahlias can grow up to 12 feet tall, they need support to prevent them from falling over. Add a stake or trellis to the planting area before or immediately after planting to provide support. Attach the stake or trellis to the stem of the plant with garden twine as it begins to grow.

Step 5: Water and Fertilize

Once planted, tree dahlias require regular watering to keep the soil consistently moist. Watering once or twice a week should be sufficient, but be sure to adjust based on the weather and soil conditions. Fertilize the plants with a balanced, water-soluble fertilizer every 4-6 weeks to promote healthy growth and blooming.

Final Thoughts

Tree dahlias can be a stunning addition to any garden, and planting them in the ground is an easy process. By following these simple steps, you can ensure that your tree dahlias grow strong, healthy, and produce beautiful blooms year after year.