Hydrangeas Plus :: Definitions

Definitions

Zone guidelines (based on USDA):

  • Zone 4 is –30 degrees F to –20 degrees F for average minimum temperatures
  • Zone 5 is –20 degrees F to –10 degrees F for average minimum temperatures
  • Zone 6 is –10 degrees F to 0 degrees F for average minimum temperatures
  • Zone 7 is 0 degrees F to 20 degrees F for average minimum temperatures
  • Zone 8 is 20 degrees F to 40 degrees F for average minimum temperatures
  • Zone 9 is 40 degrees F to 60 degrees F for average minimum temperatures

Be sure to also incorporate wind chill. These are just guidelines and microclimates and weather patterns may skew zone ratings in your particular area.

New hydrangeas should be protected in colder zones for the first few years to ensure well-developed root systems and branch structures.

Hydrangeas can be grown in zones higher or lower than illustrated in our catalog with protection from the cold and the heat. This is our best estimate for hardiness.

Mature Size – Mature size is the expected height x width in feet for a mature plant with some annual pruning.

Color in Acidic soil with AL present - Color in Acid means the color of the blooms in acidic soil or pH between 5.5 and 6.0 AND where there is ample aluminum available for the plant to absorb to change pigments.

Color in Neutral soil/no AL present – Bloom colors in neutral soil with pH between 6.5 and 7.0 and/or doesn’t have ample aluminum to change pigments.

Bloom Type – The type of bloom to expect from this variety

Bloom Time – The timing of blooms based on our experience in the Willamette Valley and our normal temperatures for zone 7/8.

Bloom Size – The size of bloom, in inches, one can expect on a mature plant’s average blooms. Incremental weather or heavy pruning can cause smaller blooms.

Sun Tolerance - Our best guess for Sun Tolerance based on our experience in zone 7/8:

  • Great – should be able to take full sun given enough water
  • Good – able to take mostly sunny areas in all but the hottest areas
  • Fair – may be able to take some afternoon sun in the north but may scorch
  • Poor – morning sun only

Cut Flower – Based on our experience, we have rated the each variety and our success using is as a cut or dried flower.

Fall Color Change – Based on our experience, we have illustrated if each variety has a noticeable foliage color change as seasons change to fall.