Hydrangeas

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• Originated in Japan.
• In the 18th century, Hydrangeas were brought to England and they
quickly became very popular flower throughout Europe
• Native Americans used the root as a diuretic and detoxifier. The
bark of the hydrangea was used to ease muscle sprains and burns
and is still used today as a tonic herb to treat bladder problems and
kidney stones.
• Faial Island is an island of Portugal and
is commonly called the ‘’blue island’’ due
to it’s abundance of native hydrangeas.
• No Hydrangea will do well in heavy shade. Most prefer morning sun
and afternoon shade.
• Plant in early summer and fall.
• Over watering can lead to root rot - so don’t!
• Transplanting should be done once the Hydrangea has been
dormant and lost all its’ leaves.
• Hydrangeas root fairly easily, and can even be started in water.
• Otherwise starting in soil with a root cutting and a growth
stimulant propagates just fine.
• Keep out of direct sunlight and do not over water.
Zone: 6 to 9 Light: Does best in part shade; usually wilts in the
afternoon in full sun Moisture: Average; leaves quickly wilt
insufficient moisture (or in full sun) Soil type: With ample organic
matter pH range: Acid to alkaline
• ‘Annabelle’ is the most popular variety of Hydrangea
arborescens.
• It’s large white drumstick like blooms can get over 10’’ in
diameter and produce every year.
• ‘Annabelle’ is hardy and does great in the cooler zones.
• Lacecaps are characterized by their unique bloom.
• The centers contain small bud-like blooms and the
edge homes open flowers.
• The flowers of lacecap hydrangeas are not tolerant
of excessive sunlight.
• They do not require much pruning, and bloom on old
wood.
• The Oakleaf gets its name from the shape of its beautiful
large leaves.
• One of the few Hydrangeas native to the U.S.
• Oakleaf Hydrangeas do not need much attention to strive,
and do well in hot, dry, areas.
• The only Hydrangea that can be pruned into a tree form!
• Paniculata’s can get very large; 8-10 ft. tall and wide is not unusual.
Leaf spot on BigLeaf Hydrangea
OakLeaf Hydrangea Anthracnose
Armillaria
root rot
Anthracnose causes cankers, which look like
sunken areas with raised margins. These can
grow large enough to encircle, or girdle, the
plant's branches and stems, killing them.
To help mitigate the damage, prune away dead or
diseased areas and dispose of these cuttings away
from the garden.
anthracnose is not curable, but you can take
steps to protect hydrangeas from infection.
Anthracnose spores move and multiply in
water, so improve soil drainage around the
plant.
Cercospora leaf spot is
favored by warm weather
with frequent rain showers.
Hydrangea macrophylla
Infected leaves in the lower part
of the plant may first be
observed in mid-summer with
small circular purple spots
scattered across them.
• Botrytis blight, also known as gray mold, is caused by the fungus Botrytis
cinerea.
• This fungus attacks damaged or diseased hydrangea leaves and flowers.
• Cool conditions encourage this fungus.
• The key to both preventing and slowing botrytis blight is proper growing
conditions.
• Hydrangea need to be planted and pruned to allow lots of air flow around
the plant.
• Rubbing the back of the leaves with Rust Disease on
it will release an orange dust which contains spores
of the fungus.
• The disease is usually seen near the end of the
growing season.
This disease requires humidity to germinate;
growing hydrangeas in shady areas increases
risk of powdery mildew disease development.
• Requires PH of 6.0 – 6.2
• Fertilizer with High Level of Phosphorus (25/10/10)
• Consider growing in large pots for easier control of the PH
• Requires Aluminum be present; add aluminum sulphate
• Lower PH – 5.2 – 5.5; to lower PH, add organic matter – coffee
grounds, fruit and vegetable peels and grass clippings.
• Fertilizer with Low Level of Phosphorus (25/5/30)
• Avoid nearness to concrete foundation or sidewalks
• ‘’Hydrangea comes from two Greek words "Hydor" and
"aggeion’’ meaning ‘’water vessel’’
• According the language of flowers, hydrangea stands for
preservation - preservation of love that lasts forever, often
used for weddings.
• Some suggest that the Hydrangeas represent anything
that is sincerely heartfelt because it possesses enduring
grace and beauty.
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