Forsythia x intermedia 'Arnold Giant'
Plant Expert:
Michael Dirr Forsythia x intermedia 'Arnold Giant'
Michael Dirr
Forsythia x intermedia 'Arnold Giant'
Forsythia x intermedia 'Arnold Giant' (click for large image)
Arnold Giant Border Forsythia
Common Names:
  • Arnold Giant Border Forsythia
 
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Sun/Water Requirements:

  Requires full sun.
Moderate climate.

Climate / Hardiness Zones:

  Zone 5 to Zone 9

Dirr says: "Dr. Ed Hasselkus, retired, University of Wisconsin, has related to me that this cultivar is hardy in Madison, WI where 'Beatrix Farrand' and other F. x intermedia types are not."

Growth:

  Range: Grows from 5' to 10'.
Dirr says: "habit more erect."

Flowers:

  Color(s): Yellow
Season(s): Spring

Dirr says: "It is sparse in flower number; it has never proven popular in commerce but has been used in crosses which resulted in some superior seedlings."  

Foliage:

  Deciduous
Color: Leaves are dark green in the summer and yellow and green in the fall.
Dirr says: "leaves are larger and thicker"  

Fruit:

  Color: Black
Season(s): Fall
 

Landscape Value:

  Can be used as a grouping plant.

Other:

  Is Resistant to Disease
Is Resistant to Insects
Is Urban Tolerant
 
Forsythia x intermedia 'Arnold Giant' is hardy in these areas:
Alameda, CAAlamo, CAAlsip, IL
American Canyon, CAAngwin, CAAntioch, CA
Baltimore, MDBayside, NYBronx, NY
Brooklyn, NYBrownsville, TXCanton, MI
Chicago, ILCicero, ILCollege Point, NY
Conneaut, OHCorona, NYDanville, CA
Detroit, MIDorset, OHEast Claridon, OH
East Elmhurst, NYEcorse, MIElmhurst, NY
Elmwood Park, ILElyria, OHEssex, CA
Evergreen Park, ILFawnskin, CAFerndale, MI
Florence, SCFlushing, NYFontana, CA
Forest Falls, CAForest Hills, NYFort Eustis, VA
Fresh Meadows, NYGlen Burnie, MDGwynn Oak, MD
Harper Woods, MIHarrison Township, MIHunt Valley, MD
Jackson Heights, NYLeasburg, NCLexington, NC
Liberty, NCLinwood, NCLittle Neck, NY
Ludlow, CAMacomb, MIMarysville, MI
Maspeth, NYMemphis, MIMercedes, TX
Middle Village, NYMission, TXModesto, CA
Moreno Valley, CAMorgantown, WVMount Clemens, MI
New Baltimore, MINew Haven, MINew York, NY
Newport News, VANorth Ridgeville, OHNorth Street, MI
Oakland Gardens, NYOlmito, TXPenitas, TX
Pharr, TXPhelan, CAPhiladelphia, PA
Pikesville, MDPinon Hills, CAPort Isabel, TX
Progreso, TXRedlands, CARego Park, NY
Rialto, CARidgewood, NYRimforest, CA
Riverdale, ILSaratoga, CASoquel, CA
Sparrows Point, MDStaten Island, NYTaylor, MI
Temperance, MITemple City, CATowson, MD
Trenton, MITres Pinos, CAUpland, CA
Virginia Beach, VAWalnut, CAWatsonville, CA
Wayne, MIWestland, MIWhitestone, NY
Whitmore Lake, MI
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