Ambrosia pear aka h2-169 - patent expires July 2026

This is a cultivar from Purdue University released through Gardens Alive conglomerate aka Gurneys etc. Gardens Alive! - Wikipedia!

Dr. Janick released honeysweet and Green Jade pears as well.
Honeysweet pear
Green jade - PP14034 - Crisp 'n Sweet™ pear

ambrosia.pdf (365.5 KB)

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Has a lot of good varieties in it’s parentage. Looks like it ripens about the same time as Harrow Delight. Oddly they called it early mid season.


Posting couple pictures of Ambrosia pear fruit:

Aug 20th 2015

Aug 20th, 2015

Aug 6th 2016

Aug 20th, 2016


It blooms around April 15th in zone 6a. For last couple years I lost battle to squirrels so did not get any pears. Trying to get it under control in 2023.


They found you and now have a map to your tree in their den!


Yeah, they are going after peaches primarily but unfortunately take pears as well. As you can see on pictures pears where not protected at all when tree was young and I was able to harvest some pears. But it’s not a case anymore. Stocking nets for this season💪

Wow! That’s a big pear. I bought one this year. It’s struggling with a foliar disease that might be fireblight though. Do you spray yours?

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I didn’t spray in recent years much, maybe Neem oil here in there. In 2023 I’m trying to adopt organic schedule. However I’m battling this leaf issue Pear disease and Insect identification - #45 by ukie still deciding how to tackle it.

2023 fruit set, white powder is Surround spray


For those who might be interested pear patents go for 20 years only on h2-169 US Patent for Pear tree named ‘H2-169’ Patent (Patent # PP 16,759 issued July 4, 2006) - Justia Patents Search

The trademark is forever on the name ambrosia

" Pear tree named ‘H2-169’

Oct 22, 2004 - Purdue Research Foundation

A new pear variety distinguished by its large size fruit of nice shape; fruit having a good quality texture and flavor; good tree type; blight tolerant (equivalent to ‘Honeysweet’ variety); early season (mid-August); and annual high productivity.

Latest Purdue Research Foundation Patents:

Skip to: Description · Claims · References Cited · Patent History · Patent History


Latin name of the genus and species of the plant claimed: Pyrus communis.

Variety denomination: ‘H2-169’.






The present invention relates to a new and distinct variety of pear tree named ‘H2-169’. Our new tree resulted from a planned hybridization program and is a selection from crossing ‘US 571’ (unpatented) as the seed parent with ‘Honeysweet’ (U.S. Plant Pat. No. 4,379) as the pollen parent (see FIG. 1). The resulting tree was selected when growing in a cultivated area in West Lafayette, Ind.


The ‘H2-169’ variety is distinguished from other pear varieties due to the following unique combination of characteristics: large size fruit of nice shape; fruit has a good quality texture and flavor; good tree type; blight tolerant (equivalent to ‘Honeysweet’ variety); early season (mid-August); and annual high productivity.

Asexual reproduction of this new variety by grafting and budding onto rootstock [‘Old Home×Farmingdale’ variety rootstock (U.S. Plant Pat. No. 6,362)] shows that the foregoing characteristics come true to form, are firmly fixed, and are established and transmitted through succeeding propagations.

The following detailed description concerns the original tree, selected on Aug. 20, 1993, and progeny first asexually propagated in 1996. The original tree and progeny have been observed growing in a cultivated area in West Lafayette, Ind.

Certain characteristics of this variety may change with changing environmental conditions (such as photoperiod, temperature, moisture, soil conditions, nutrient availability, or other factors). For example, leaf colors may be brighter green if the trees are grown in soil with greater nitrogen concentrations, and may be more yellow when grown in soil containing lesser amounts of nitrogen. Color descriptions and other terminology are used in accordance with their ordinary dictionary descriptions, unless the context clearly indicates otherwise. Color designations (hue/value/chroma) are made with reference to The Royal Horticultural Society Colour Chart (R.H.S.).


FIG. 1 is a photograph showing typical fruit and leaves of the new variety.

FIG. 2 is a photograph showing a tree of the new variety.

The color photographs shows typical specimens of the leaves and fruit and tree of this new pear tree variety and depict the color as nearly true as is reasonably possible to make the same in a color illustration of this character. It should be noted that colors may vary, for example due to lighting conditions at the time the photograph is taken. Therefore, color characteristics of this new variety should be determined with reference to the observations described herein, rather than from the photographs alone.



The following detailed description of the ‘H2-169’ variety is based on observations of asexually reproduced progeny. The observed progeny are trees which were 7 years of age and growing on ‘Old Home×Farmingdale’ variety rootstock (U.S. Plant Pat. No. 6,362) in West Lafayette, Ind.

  • Scientific name: Pyrus communis ‘H2-169’.
  • Parentage:
      • Seed parent.—‘US 571’ (unpatented), which resulted from a cross between ‘Michigan US 437’ (unpatented) and ‘Comice’ (unpatented).
      • Pollen parent.—‘Honeysweet’ (U.S. Plant Pat. No. 4,379).
  • Tree:
      • *Vigor.—*Vigorous.
      • *Overall shape.—*Rounded.
      • *Height.—*About 10 to 12.
      • *Width.—*Overall spread of about 11 feet.
      • *Caliper.—*92 cm at 60 cm above the ground.
      • *Trunk.—*Medium.
      • *Trunk bark texture.—*Rough and scaly.
      • *Trunk bark color.—*Greyed-green (RHS 197A).
      • *Patches or other markings.—*Exfoliates, brown (RHS 200A) in color.
      • *Primary branches.—*Upright.
      • *Angle of emergence from trunk.—*About 45 degrees. Angle does not vary from top to bottom of tree.
      • *Branch color.—*One-year old branches are greyed-red (RHS 178A) in color, while two-year old branches are grey-orange (RHS 177B) in color.
      • *Branch pubescence.—*None.
      • *Branch lenticels.—*Medium density, approximately 5 per square centimeter; round shape, typical examples of which measured about 1.2 mm in diameter; greyed-green (RHS 197D) in color.
      • *Internodes.—*Average internode length is about 3 cm on a one-year old shoot.
      • *Bearing.—*Annual.
      • *Hardiness.—*Zone 5B.
      • *Disease resistance.—*Tolerant to fireblight, similar to the ‘Honeysweet’ variety.
  • Leaves:
      • *Texture.—*Smooth.
      • *Sheen.—*Glossy.
      • *Length.—*About 68 mm to about 86 mm, averaging about 76 mm in 10 leaves.
      • *Width.—*About 47 mm to about 59 mm, averaging about 51.2 mm in 10 leaves.
      • *Thickness.—*About 0.26 mm to about 0.31 mm, averaging about 0.28 mm in 10 leaves.
      • *Petiole.—*About 61.2 mm long and about 1.2 mm in diameter; yellow-green in color (RHS 150B). No pubescence.
      • *Margin.—*Smooth.
      • *Tip shape.—*Acuminate.
      • *Stipules.—*None.
      • *Leaf color.—*Upper leaf surface: yellow-green (RHS 146A). Lower leaf surface: yellow-green (RHS 146D). Vein: yellow-green (RHS 150B).
      • *Pubescence.—*None.

The length, width, thickness and other measurements were obtained from observations of ten typical leaves in West Lafayette, Ind. on Sep. 10 or 13, 2004.

  • Flowers:
      • *Size.—*Medium size, typical flower measuring about 33 mm to 35 mm across.
      • *Shape.—*Radially symmetrical.
      • *Color.—*Unopened bud: white (RHS N155D) with pink spots (RHS 49B). Opened flower: white (RHS N155D).
      • *Petals.—*5 petals per flower; not touching when open; rounded in shape; about 16 mm (to slightly larger) long. White in color (RHS N155D).
      • *Stamen.—*Arranged in a single row. 20 stamens, each about 6 mm long and white (RHS 155D) in color.
      • *Anthers.—*Red-purple (RHS 58D) in color.
      • *Pistil.—*Stigma is about 9 mm long; rounded at top; 5 styles, fused at base, and green-yellow (RHS 1D) in color.
      • *Sepals.—*About 5 mm and about 3.5 mm wide (at base); reflexed shape; yellow-green (RHS 144C) in color; pubescent.
      • *Pollen.—*Yellow (RHS 3C) in color.
      • *Fragrance.—*Very slight fetid.
      • *Bloom season.—*In 2004 in West Lafayette, Ind., full bloom observed on April 17 for ‘Bartlett’ (unpatented) variety; April 18 for ‘H2-169’ variety; and April 19 for ‘Honeysweet’ variety.
  • Fruit: (Observations from a limited number of typical fruit in West Lafayette, Ind.).
      • *Size.—*Large, about 91 mm long and 74 mm wide to 120 mm long and 82 mm wide.
      • *Form.—*Pyriform; symmetric. Length to diameter ratio 1.35; no ribbing; no lobes at calyx end.
      • *Cavity.—*None.
      • Basin (blossom end).—About 4.5 mm deep and about 25 mm wide; no pubescence.
      • *Stem.—*Short and stout; about 19 mm long and 4 mm in diameter; greyed-orange (RHS 165A) in color.
      • *Locules.—*Small; 5 locules; closed. Seeds adhere to carpel wall.
      • *Skin.—*Thin with glossy finish. No tendency to become waxy or oily in storage.
      • *Lenticels.—*Conspicuous; small and round with russetting; grey-orange (RHS 165C); no tendency to crack with maturity.
      • *Color.—*General color effect: occasional slight blush. Ground color: green-yellow (RHS 1D). Overcolor: orange (RHS 26A). Russetting: Present, fine, very light to heavy.
      • *Fruit properties after ripening time during harvest period in West Lafayette, Ind.—*Acid content: About 0.147 g/100 ml malic acid. Firmness: About 7 kg to 10 kg for green fruit and 0.5 kg to 2.2 kg for ripe fruit. Soluble solids: About 13%-15%. Starch index: On a scale of 1 (high starch) to 5 (low starch), average about 3.5 for green fruit and 5 for ripe fruit. Flavor: Sweet; mild to rich flavor. Juiciness: Juicy. Flesh color: Yellow-white (RHS 158D). Flesh texture: Smooth and buttery. No obvious grit cells, even at stem and base. Aroma: slight.
      • *Core.—*Basal bundle area shape; about 22 mm long and about 40 mm wide; calyx tube closed. Core lines defined weakly.
      • *Seed.—*About 1 seed per cell; acuminate; about 10.3 mm long and about 5.7 mm wide; greyed-purple (RHS 187A) in color.
      • *Fruit production.—*First picking date in 2004 in West Lafayette, Ind. was about August 12, and last picking date was about August 20.
      • *Storage.—*Fruit remains very fresh at room temperature for 5 days, and can be stored up to 6 weeks in cold storage (1° C.).
      • *Usage.—*Dessert.


  1. A new and distinct variety of pear tree, substantially as herein shown and described.

Referenced Cited

U.S. Patent Documents

PP4379 February 13, 1979 Janick
PP6362 November 1, 1988 Brooks

Patent History

Patent number: PP16759
Type: Grant
Filed: Oct 22, 2004
Date of Patent: Jul 4, 2006
Patent Publication Number: 20060090231
Assignee: Purdue Research Foundation (West Lafayette, IN)
Inventor: Jules Janick (West Lafayette, IN)
Primary Examiner: Kent Bell
Assistant Examiner: W. C. Haas
Attorney: Klarquist Sparkman
Application Number: 10/971,719


Current U.S. Class: Pear (PLT/176)
International Classification: A01H 5/00 (20060101);"

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Let me drop some pictures… Ambrosia pear, August 19th 2023.


Those are enormous! I might have to stop by for a stick in a couple years if you don’t mind trading.



Full bloom, April 13, 2024