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Scientific Name: Hydrangea macrophylla
Pronunciation: hye-DRAIN-juh mack-roe-FILL-uh
Common Name: bigleaf hydrangea
Family Name: Hydrangeaceae
Plant Type: Flowering pot plant, Shrub - deciduous
Key ID Features: Twiggy, deciduous shrub; leaves large, opposite, broadly ovate, coarse toothed; flowers flattened corymbs (mop-head or lace-cap), large blue to pink bracts (depends on soil acidity). Winter ID: buds opposite, large triangular leaf scars with 3 bundle scars; persistent round flower panicles (if not pruned).
Course(s): AARB 1012, HORT 1155, HORT 1193/1293, Level 1 Apprenticeship

Habit: Dense, Spreading, Twiggy
Form: Round
Texture: Coarse
Mature Size:
Height:1.3 - 2.0m
Spread:1.5 - 2.0m
Growth Rate:Fast
Origin: (Japan)
Hardiness Rating: Zone 6: (-23 to -18 C)
Exposure: Deep shade, Filtered shade, Part sun/part shade
Soil/ Growing Medium: Acidic, Alkaline, Well-drained
Water Use: High
Landscape Uses: Cut flower or foliage, Group or mass planting, Indoor plant, Mixed shrub border, Specimen plant, Summer interest
Additional Info: Google. Cultivars shown or on campus may include H. 'Mariesii', H. ‘Mariesii Variegata', H. 'All Summer Beauty', H. 'Berlin Rabe', and H. 'Teller Blue'.
bigleaf hydrangea
Leaf Morphology:
Form: Simple
Arrangement: Opposite
Texture/ Venation: Heavily veined
Surfaces: Glabrous, Lustrous, Pubescent
Colour in Summer: Green, Dark-green
Colour in Fall: Yellow
Leaf(let) Terms:
Shapes: Elliptic, Obovate, Ovate
Apices: Acuminate
Bases: Cuneate
Margins: Dentate, Serrate

Inflorescence Type: Floriferous, Corymb
Flower Morphology:
Number of Petals:4
Corolla Shape:Rotate/stellate
Ovary Position:Inferior
Colour (petals): Showy, White, Violet, Blue, Pink, (acidic soil -> blue flowers; alkaline soil -> pink flowers )
Flower Scent: None
Flower Time at Peak: Jul, Aug, Sep
Additional Info: Lacecap or mophead (sterile flowers with showy sepals also in center of infloresence).

Fruit Type: Capsule
Fruit Colour: Brown
Fruiting Time:
Additional Info: Fruit insignificant

Bark Morphology: Prominent lenticels, Multi-stem trunk
Bark or Stem Colour: Tan
Leaf Scar Shape:Heart shaped

Propagation: Seed, Softwood cuttings, Hardwood cuttings, Stem tip cuttings, Eye (leaf bud) cuttings
Plant Care:
Optimal Temp.: Medium indoor temperature
Light Level:High indoor light level
Other:Underwatering is a common problem indoors.
Pest Susceptibility: Deer resistant, Rabbit resistant, Fungal leaf spot, Mites, Mold, Rust, Scale insects, Slugs or snails, Abiotic disorder, Mildew
(GAZ) GAZebo
(GAZW) GAZebo West : cv. Mariesii Variegata
(NRY) NuRserY : cvs. All Summer Beauty, Berlin Rape, Tellers Blue
(ONW) Overpass North side West : cv. Mariesii
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