Fall Hours

9:00am-6:00pm Daily

5050 SE Stark • 503-231-5050

9000 SE Division • 503-788-9000

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Portland Nursery



Repeat Blooming Hydrangeas

The latest Hydrangea breeding has produced a dizzying array of repeat flowering plants. Old-fashioned Hydrangeas set buds on the previous year’s growth, but the new Hydrangeas set flower buds on both old wood and new wood. In Portland, this means flowers from June through frost!


Dwarf Hydrangeas

Love Hydrangeas but don’t have the space? Dwarf Hydrangeas are the answer. Most mature below 3’ and work well both for containers and in small garden spaces. Thanks to busy breeders, there are many to offer & here are a few:

  • Bigleaf Hydrangeas: Hydrangea macrophylla — Berlin, Pia, Rio & Wedding Gown
  • Peegee Hydrangeas: Hydrangea paniculata — Baby Lace, Bobo, Peewee
  • Oakleaf Hydrangeas: Hydrangea quercifolia — Peewee, Sikes Dwarf

Hydrangea Species


Climbing Hydrangea

  • Hydrangea anomala petiolaris
  • White lacecap flowers, May-June
  • Self-attaching vine
  • Fast-growing, 15-25’
  • Shade to part shade


Smooth-leaf Hydrangea

  • Hydrangea arborescens
  • Huge green white or pink flowers in July-August
  • Blooms on new growth
  • Prune in late winter
  • Part shade


Rough-leaf Hydrangea

  • Hydrangea aspera
  • Pretty lavender lacecap flowers in summer
  • Quilty leaf texture
  • Excellent peeling bark
  • Best in afternoon shade


Evergreen Climbing Hydrangeas

  • Hydrangea integrifolia & H. seemanii
  • White lacecap flowers, May-June
  • Glossy evergreen leaves
  • Self-attaching
  • Best in afternoon shade


Big-leaf Hydrangea

  • Hydrangea macrophylla
  • Pink blue or white flowers
  • Mophead or Lacecap
  • Some varieties repeat bloom through summer
  • Best in afternoon shade


PeeGee Hydrangea

  • Hydrangea paniculata
  • White green or pink flowers
  • Blooms in July
  • Dwarf & tall-growing varieties available
  • Sun-part shade


Oakleaf Hydrangea

  • Hydrangea quercifolia
  • White flowers in cone-shape clusters, June-July
  • Oak-leaf shape leaves turn dark maroon red in fall
  • Part shade, sun ok


Mountain Hydrangea

  • Hydrangea serrata
  • Delicate lacecap pink or blue flowers in July-August
  • Pretty fall color
  • Part shade or full shade

Hydrangea anomala petiolaris
Climbing Hydrangea


Family: Hydrangeaceae

Genus: Hydrangea from the Greek hydor meaning water, and aggeion, meaning vessel; a reference to cup-shaped fruit

Common Name: Hydrangea

Origin: China, Japan, Himalayas, Philippines, Indonesia, North and South America

Characteristics: About 100 species of shrubs, small trees or vines.

Two types of flowers are present on most Hydrangeas – fertile & sterile.

Fertile flowers are small and inconspicuous, and are usually found near the center of a cluster.

Sterile flowers are large and showy. Flowers are held in differing cluster formations.

mophead108Mophead – Round or dome-shape clusters of mostly large sterile flowers hide fertile flowers beneath. Blue, pink, lavender, green, white & combinations of these colors are available. Find mopheads on Hydrangea arborescens, Hydrangea macrophylla and Hydrangea serrata.

lacecapLacecap – Flat round clusters of small fertile flowers edged by larger sterile flowers available in white, pink, lavender and blue. Find lacecaps on Hydrangea aspera, Hydrangea macrophylla and Hydrangea serrata, as well as the climbing Hydrangeas, H. anomala petiolaris, H. integrifolia & H. seemanii.

paniclePanicle/Cone - Long cone-shape clusters of white green or pink flowers. Some are so full of big sterile flowers that small fertile flowers disappear. Others are more open & have a lacy appearance. Find cone flowers on Hydrangea paniculata and Hydrangea quercifolia.

Leaves are deciduous or evergreen and vary from simple, opposite or in whorls of three, oval or toothed, smooth or serrated. Many Hydrangea varieties develop lovely red to dark purple & mahogany fall color. Peely bark adds winter interest on some species.

Flower Color:
Blue & pink flowers of Bigleaf Hydrangeas, Hydrangea macrophylla change color depending on soil pH.

  • Low pH is acidic = blue flowers
  • Higher pH is more alkaline = pink flowers
  • Mid-range pH = purple flowers

Soils west of the Cascades are typically acidic, so Hydrangeas are typically blue when planted in the ground.

To Change Colors:

  • To turn flowers purple or pink, add lime to the planting area & reapply twice a year.
  • To deepen blue color, add Aluminum sulfate once a year.
  • To maintain a specific pH, test the pH twice a year using a soil test kit.
  • White hydrangea color cannot be manipulated with soil pH.

pH Flower Color

  • 4.5 deep, intense blue
  • 5.0 medium blue
  • 5.5 lavender-purple
  • 6.0 pink-purple
  • 6.5 mauve-pink
  • 6.8 medium pink
  • 7.0 intense, deep pink

Culture: Most Hydrangeas perform best when planted in dappled or afternoon shade. Those in full sun often burn and require extra watering.

Pee Gee Hydrangeas (H. paniculata), and Oak Leaf Hydrangeas (H. quercifolia) are exceptions that can be planted in sunny spots but will still perform well in part shade. Soil should be consistently moist and well-drained. Cold tolerance varies.

Fertilizing: For blue flowers, use fertilizer for acid-loving plants. Use rose & flower food for all other hydrangeas. In all cases, follow the package directions for whatever food you choose.

Remove dead flowers in fall or late winter. Count 2 leaf-sets beneath the flower cluster and cut just above the second set. Repeat-blooming Hydrangeas can be dead-headed as old flowers fade.

Hydrangea arborescens blooms on new wood, so prune branches to knee-level in late winter.

Rejuvenating or down-sizing large Hydrangeas – in late winter, take a long look at the overall structure of the plant.

Make 3-5 thinning cuts evenly through the body of the plant, choosing the branches are the most offending and cut them back to a major branch or to the ground.

After each cut, step back and choose the next wisely.

Remove dead wood, and branches that are growing toward the interior of the plant.

This type of careful pruning encourages growth in the interior & from the base during spring.

Next, remove dead flowers and cut back branch tips. Count 2 leaf nodes down from branch tips and cut above the second node. This ensures summer flowers.

Pests & Diseases: Hydrangeas are prone to fungal problems, but they are typically not life-threatening. Leaf Spots and Powdery Mildew are the most common diseases in Portland, and they can often be avoided by increasing soil drainage and air circulation in the environment of the plant. If plants become diseased, remove affected foliage, remove all leaves from beneath the plant in fall when leaves drop naturally, and mulch the ground under the plant. Fungicides are available in addition to cultural treatment.

Succulent new growth attracts slugs, aphids and deer. All can distort and stunt growth. Slugs can be effectively controlled with bait or beer, aphids can be washed off with water or insecticidal soap, and there are several sprays out there that deter deer.