Incrediball Smooth Hydrangea
Hydrangea Arborescens
Hydrangea Arborescens, commonly known as Incrediball Smooth Hydrangea, is cherished for its large, round blooms and lush foliage. Native to North America, it thrives in various garden settings and is a favorite for its easy care and stunning floral displays.
Everything it needs
9 essentials at a glance
Watering
Hydrangea Arborescens prefers consistently moist soil, especially during the growing season.
Water deeply once a week, increasing frequency during hot, dry spells. During the winter, reduce watering as the plant enters dormancy. Signs of over-watering include yellowing leaves and root rot, while under-watering can cause wilting and leaf drop.
Light
This hydrangea thrives in partial to full sun, ideally receiving 4 to 6 hours of direct sunlight daily.
It can tolerate some shade, especially in hotter climates, but too much shade may reduce flowering. Ideal placement is in a location that gets morning sun and afternoon shade.
Soil
Hydrangea Arborescens prefers well-draining, rich, loamy soil with a pH range of 5.5 to 7.0.
A potting mix that includes compost, peat moss, and perlite is recommended to ensure proper drainage and nutrient availability.
Humidity
This plant enjoys moderate humidity levels, ideally between 40% and 60%.
To increase humidity, mist the leaves or place a humidifier nearby. Signs of low humidity stress include browning leaf edges and wilting.
Temperature
Hydrangea Arborescens thrives in temperatures between 65°F and 80°F (18°C to 27°C).
It is hardy in zones 3 to 9 and can tolerate brief cold snaps but should be protected from extreme heat and frost.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 or similar, applying every 4 to 6 weeks during the growing season.
In early spring, a slow-release fertilizer can be beneficial. Signs of nutrient deficiency include yellowing leaves and poor flowering.
Pruning
Prune Hydrangea Arborescens in late winter or early spring before new growth begins.
Use clean, sharp pruning shears to remove dead or weak stems and to shape the plant. Deadheading spent flowers after blooming can encourage new growth and improve appearance.
Repotting
Repot every 2 to 3 years or when the plant becomes root-bound.
Signs it needs repotting include roots growing out of the drainage holes or stunted growth. Choose a pot 1 to 2 inches larger in diameter and follow up with fresh potting mix.
Propagation
Propagation can be done through stem cuttings or division.
For stem cuttings, take 4 to 6-inch cuttings in late spring or early summer, remove lower leaves, and place them in a moist potting mix. Keep the cuttings in a warm, humid environment until roots develop. Division can be done in early spring or fall by carefully separating the root ball into smaller sections.
When it's unhappy
Yellow leaves
Why it happens
This can be caused by over-watering, nutrient deficiency, or poor drainage.
How to fix it
Check soil moisture levels and adjust watering accordingly. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Wilting
Why it happens
Wilting can occur due to under-watering or extreme heat.
How to fix it
Ensure regular watering, especially during hot weather, and provide shade during peak sun hours.
Brown leaf edges
Why it happens
This is often a sign of low humidity or inconsistent watering.
How to fix it
Increase humidity by misting the plant or using a humidifier, and maintain consistent moisture in the soil.
Poor flowering
Why it happens
Insufficient sunlight or nutrient deficiency can lead to reduced blooms.
How to fix it
Ensure the plant receives adequate sunlight and consider applying a balanced fertilizer to promote blooming.
Root rot
Why it happens
Over-watering and poor drainage can lead to root rot.
How to fix it
Allow the soil to dry out between waterings and ensure proper drainage in the pot.
Care through the year
Spring
In spring, prune the plant before new growth begins and apply a balanced fertilizer to promote healthy growth. Ensure consistent watering as temperatures rise.
Summer
During summer, maintain consistent moisture and provide some afternoon shade in extremely hot weather. Deadhead spent flowers to encourage new blooms.
Fall
In fall, reduce watering as the plant prepares for dormancy. Mulch around the base to protect roots from frost and maintain soil moisture.
Winter
In winter, minimize watering and protect the plant from extreme cold. If in a pot, consider moving it indoors or to a sheltered location.
Toxicity & Safety
Hydrangea Arborescens is considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. The leaves and flowers are the most commonly ingested parts.
Good to know
How often should I water my Hydrangea Arborescens?
Water your Hydrangea Arborescens deeply once a week, increasing frequency during hot, dry spells. Ensure the soil remains consistently moist but not soggy.
Why are my Hydrangea leaves turning yellow?
Yellowing leaves can indicate over-watering or nutrient deficiency. Check the soil moisture and consider fertilizing if necessary.
When is the best time to prune my Hydrangea Arborescens?
The best time to prune is late winter or early spring before new growth begins. This encourages healthy growth and flowering.
What type of soil is best for Hydrangea Arborescens?
Hydrangea Arborescens thrives in well-draining, rich, loamy soil with a pH range of 5.5 to 7.0. A mix of compost and peat moss is ideal.
How can I increase humidity for my Hydrangea?
To increase humidity, mist the leaves regularly or place a humidifier nearby. This helps prevent browning leaf edges and wilting.
What should I do if my Hydrangea is not flowering?
If your Hydrangea is not flowering, ensure it receives adequate sunlight and consider fertilizing with a balanced fertilizer to promote blooms.
Can I grow Hydrangea Arborescens in a pot?
Yes, Hydrangea Arborescens can be grown in pots. Ensure the pot has good drainage and use a suitable potting mix to support healthy growth.
Grows well with
Related care guides
Explore remedies
Track this plant in your garden.
Set care reminders, log growth, and join a community of plant lovers.