How to Grow Ruby Spice Summersweet - Plant Care & Tips

By NorwichGardener Team   /   2024

Ruby spice summersweet is an excellent plant for adding spice and flavor to any dish. It is a member of the mint family and has a strong flavor that is both sweet and slightly spicy. This plant is easy to grow and can be found in most nurseries or online.

How to Grow Ruby Spice Summersweet - Plant Care & Tips

Also called

  • Agrimonia striata
  • Alcea rosea
  • Calendula officinalis
  • Dianthus caryophyllus
  • Humulus lupulus

Good to Know

  • Botanical name: Rhododendron x ‘Ruby Spice’
  • hybrid of Rhododendron maximum and Rhododendron catawbiense
  • Aromatic foliage
  • Dark green, glossy leaves
  • Flowers bloom in late spring to early summer
  • White or pale pink flowers
  • Grows to 6-8’ tall and wide
  • Prefers full sun to partial shade
  • Well-drained, acidic soil
  • Hardy in USDA zones 4-8

Related plant:
Hydrangea Quercifolia Ruby Slippers

How to Grow

  1. For ruby spice summersweet, first step is to locate a planting site. The site should be in full sun and have well-drained soil.
  2. Set out the plants in early spring, spacing them 18 to 24 inches apart.
  3. Dig a hole for each plant that is twice as wide as the plant’s root ball.
  4. Set the plant in the hole so that the top of the root ball is even with the soil surface.
  5. Fill in around the plant with soil, tamping it down gently as you go.
  6. Water the plant well.
  7. Apply a layer of mulch around the plant, keeping it several inches away from the stem.
  8. Ruby spice summersweet is a low-maintenance plant, so there is no need to fertilize it.
  9. Prune the plant in late winter or early spring to shape it and remove any winter damage.
  10. Enjoy the sweet-smelling flowers of your ruby spice summersweet all summer long!

Related plant:
Ruby Slippers Oakleaf Hydrangea

The Soil

About soil condition, ruby spice summersweet prefers well-drained soils but can also tolerate some standing water in its roots. It also does not like very sandy soils. This plant can grow in both full sun and partial shade but needs at least four hours of direct sunlight each day to produce the best results.

About light

Like the other shrubs, the ruby spice summersweet requires sun to grow properly. Along with water and nutrients, sunlight is essential for shrub growth. The amount of sun required varies by plant species, but generally, six hours of direct sunlight is needed for optimal growth. If you live in an area with hot summers, you may need to provide shade for your shrub during the midday hours to prevent scorching.

The Temperature

The temperature conditions for growing Ruby Spice Summersweet are ideal. It prefers full sun to partial shade and soil that is moist but well-drained. It is tolerant of a wide range of soil types and pH levels. It will grow in sandy soil, loamy soil, or clay soil. It is also tolerant of drought and salt spray.

Ideal Humidity

Ideal humidity condition for this plant is around 40-50%. This plant can tolerate some shade, but too much shade will make the leaves turn yellow. If the plant is not getting enough light, the flowers will not be as vibrant. This plant is not drought tolerant, so make sure to water it regularly during the growing season.

Fertilizing

About fertilizer, usually the plant doesn't need that much. You can just use a very small amount of low nitrogen fertilizer when you first plant it. For the root, it's important to not damage it when you're planting. You want to be very careful when you're digging the hole and putting the plant in. Make sure not to pull on the plant too much, or it could damage the roots.

About light

Pruning is an important part of caring for your ruby spice summersweet plant. Pruning helps to promote new growth and keep the plant healthy. When pruning, be sure to remove any dead or diseased leaves and branches. Cut back any overgrown branches to encourage new growth.

About Propagating

Propagation is best done in the spring or summer when the plant is actively growing. Take stem cuttings from new growth, using a sharp knife or pruners. Cuttings should be 4-6 inches long, and have at least 2-3 leaf nodes. Remove the bottom leaves, and dip the cut end in rooting hormone. Plant the cuttings in a well-drained potting mix, and keep them moist. Roots should form in 4-6 weeks. You can then transplant the rooted cuttings into individual pots or into the garden.

Growth Rate

Usually, the plant growth rate is rapid during the first few years after planting. After that, growth slows somewhat, but the plant still adds 2 to 3 feet of height each year until it reaches full size. Flowering occurs in mid- to late summer, with masses of fragrant, deep pink flowers blooming all along the length of the stems.

The Problems

Common problems for this kind of plant are canker, powdery mildew, and root rot. Canker is a fungal disease that affects the bark of the plant, causing it to crack and ooze. Powdery mildew is a white powdery fungus that grows on the leaves of the plant, causing them to yellow and drop off. Root rot is a condition caused by too much moisture around the roots of the plant, causing them to rot and die.

Tips on Growing

  • Make sure to plant your ruby spice summersweet in an area that receives full sun.
  • The soil should be well-draining and rich in organic matter.
  • Space your plants at least 18 inches apart to allow for proper air circulation.
  • Use a trellis or other support structure to help the plant grow upright.
  • Keep the soil evenly moist throughout the growing season.
  • Fertilize your plant every few weeks with a high-quality fertilizer.
  • Prune back the plant in late winter or early spring to encourage new growth.
  • Inspect your plant regularly for signs of pests or disease.
  • Harvest the ruby spice Summersweet flowers when they are fully open.
  • Enjoy your beautiful ruby spice Summersweet plant!

Related Plants

  • Summersweet: Clethra alnifolia
  • Summersweet, northern sweet pepperbush, sweet pepperbush: Clethra acuminata
  • Summersweet: Clethra barbinervis
  • Summersweet: Clethra humilis
  • Summersweet: Clethra michauxii
  • Summersweet: Clethra obtusifolia
  • Summersweet: Clethra rubra
  • Summersweet: Clethra tomentosa
  • Lobed chicory, chicory, tall chicory: Cichorium intybus
  • Yellow Wood, Summersweet: Clethra arborea

Source:
Ruby SPICE Wrapper - Arizona State University
RUBY SPICE WRAPPER. N. M. Estes, K. S. Bowley, V. H. Silva, …
Growing Summersweet Clethra in the Home Landscape

Richelle Author Photo
Reviewed & Published by Richelle
Submitted by our contributor
Shrubs Category