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Hydrangea (Hardy types for Colorado) 
The hydrangea species consists of over one hundred varieties. There are 4 categories of hydrangeas that are popular and are marketed extensively in the United States. The categories are:
Hydrangea macrophylla (Not well suited for Colorado, but some avid gardeners have had some success with a few types)
Hydrangea arborescens, Annabelle is very hardy!
Hydrangea quercifolia, Pee Gee has had fair success in Colorado
Hydrangea paniculata.   All types very hardy!
The aforementioned hydrangeas can be described as a deciduous perennial shrub with low woody branches. Hydrangeas are popular for its wide variety of colors and numerous uses. The Hydrangea varieties that can be found that will do well in zones 3 through 6 (Colorado) are listed below. Most varieties prefer full sun, but not harsh sun, they can use late afternoon shade to prevent wilting. Plant them in well drained, rich, loamy soil. If your soils are not rich and loamy, we suggest amending the soil before planting. Amend with rich compost for best results. Hydrangeas should be kept moist in the growing season for the best flower production. Pruning, if needed, should be done in the winter or early spring. Hydrangeas can be cut back close to the ground if they get too large are damaged.

 'Hydrangea arborescens 'Annabelle'
The Hydrangea Annabelle, , is a wonderful hydrangea that produces white flowers up to 12 inches across. Annabelle blooms every year even after severe pruning or intensely cold winters. The huge, white blooms appear in profusion every year without fail in early to late summer. It is perhaps the most popular old-fashioned shrub grown in American gardens today. The flower size increases as the season continues, so that the final flush is an extraordinary show! Use Annabelle in borders, hedges, foundation, or accent plantings.Mature Height 4 - 5 feet
Mature Spread 3 - 5 feet
Soil Type Widely Adaptable
Moisture Widely Adaptable
Mature Form Mounding

 Hydrangea Paniculata 'Late Panicle', 'Pee Gee', 'Limelight'
  Paniculata hydrangeas will grow and bloom in a wide variety of climates (hardy to Zone 3!). Unlike mopheads, they need several hours of sun to do well. If your weather is too cold to grow the pink and blue hydrangeas or if your landscape doesn't have much shade, consider growing one of the many types of paniculatas. North or south, we can all enjoy them. Another desirable trait of all paniculatas is their tolerance for pruning. One can prune them at any time except when they begin forming bloom heads in the summer. The paniculata is the ONLY hydrangea that can be pruned into a tree form.The name "paniculata" comes from the fact that many of the blooms are panicle-shaped (somewhat cone shaped) rather than ball-shaped. Many paniculata blooms develop a lovely pink shade as the blooms age, extending their beauty into the fall. Paniculatas often get very large. 8-10 feet tall and wide is not unusual. A beautiful paniculata, and one of the most popular is 'Limelight' which can be grown in all parts of the United States except those areas which receive no freezing weather.
      The best known Hydrangea paniculata is PeeGee. This hydrangea gets its nickname from its botanical name, H. paniculata 'Grandiflora' (PG). Although PG refers only to the 'Grandiflora' variety, many nurserymen have started referring to all paniculatas as PeeGees.This shrub has white airy flowers that can reach 10-12" in length in late August. The flowers are a mixture of sterile and fertile flowers which gives the flowers less density and less likelihood to tip or droop. Flowers will turn bronze in fall. These shrubs are fast growing and are great for informal screens, specimen plants, or for cut arrangements. Prune every year in the fall after blooming, no more than 1/3 of the plant. These plants look best when they are kept pruned to keep them thick at the base. They are hardy. 
Mature Height 6 - 8 feet
Mature Spread 8 - 10 feet
Soil Type Widely Adaptable
Moisture Moist to Adaptable
Mature Form Round

Hydrangea macrophylla 'Endless Summer'
Endless Summer Mophead Hydrangea
zones 4-9 or so they say. A gorgeous plant! Macrophyllas dont adapt well to Colorado climate, but some have had success with this variety.
The first macrophylla type to bloom on both old and new wood for large, colorful flower mops all season long! Remarkably hardy and more mildew resistant than other varieties. You can be confident that you'll get flowers every year all season long with Endless Summer.
Bloom Color: Blue (pink in alkaline soils)
Bloom Time: Summer
Foliage Color: Green
Height: 3-5'
Spread: 3-5'
  • Brilliant flower clusters
  • Lots of varieties
  • Great cut flowers
  • ​​Max Elevation 6,500ft

Height: 3-8ft 

Spread: 3-8ft