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

  Requires full sun.
Moderate climate.

Climate / Hardiness Zones:

  Zone 5 to Zone 9

Dirr says: "It is a tetraploid and shows better flower bud hardiness than 'Beatrix Farrand'"

Growth:

  Range: Grows from 5' to 10'.
Dirr says: "of bushier habit and not as tall as 'Beatrix Farrand'"

Flowers:

  Color(s): Yellow
Season(s): Spring

Dirr says: "the deep yellow flowers are a shade darker than 'Beatrix Farrand' and may be 1 3/4" across and are more or less horizontally disposed so their deep yelllow to yellow-orange throats provide a golden glow to the entire shrub."  

Foliage:

  Deciduous
Color: Leaves are dark green and green in the summer and yellow and green in the fall.
 

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 'Karl Sax' 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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