Plant Patent Drawings: 7 Critical Rules for Color Figures

Almost every rule practitioners know about patent figures comes from 37 CFR 1.84, and almost every one of them bends when the application is for a plant. Plant patent drawings are governed by their own provision, 37 CFR 1.165, and it inverts two assumptions that drive utility drafting: that black ink is the default, and that color must be justified by petition. In a plant application color is not a concession. Where color distinguishes the variety, color is the requirement — and no petition is needed. Get that backwards and you file a monochrome set that fails to disclose the very characteristic the patent is meant to claim.

What plant patent drawings have to show

A plant patent under 35 U.S.C. 161 covers a distinct and new variety of plant that has been asexually reproduced — cultivated sports, mutants, hybrids and newly found seedlings, but not a tuber-propagated plant or one found in an uncultivated state. Asexual reproduction is what proves the variety is stable and uniform, and the inventor must have carried it out or observed it.

The drawing’s job follows directly from that. 37 CFR 1.165(a) requires that the drawing disclose all the distinctive characteristics of the plant capable of visual representation. That is a disclosure standard, not a formalities standard. If the novelty of your cultivar is a particular flush of bronze on new foliage, a doubled petal count or a variegation pattern, the figure set has to carry it, because the examiner has nothing else to look at.

This is why plant filings fail in a way utility filings rarely do. A utility figure that is merely adequate still supports a claim built from words. In a plant application the figure is doing evidentiary work no amount of prose can substitute for.

37 CFR 1.165: the rule that actually governs

The operative text of 37 CFR 1.165 is short, and every clause of it matters:

• 1.165(a) — execution. Plant patent drawings “should be artistically and competently executed” and must comply with the requirements of 37 CFR 1.84.
• 1.165(a) — view numbers and reference characters. These “need not be employed unless required by the examiner.” This is a genuine departure from utility practice, where reference numerals are mandatory and must be reconciled against the description.
• 1.165(a) — disclosure. The drawing must disclose all the distinctive characteristics of the plant capable of visual representation.
• 1.165(b) — color. The drawing must be in color if color is a distinguishing characteristic of the new variety.
• 1.165(b) — copies. Two copies of color drawings or photographs must be submitted.

Note the structure. 1.165 does not displace 1.84 — it incorporates it and then carves out exceptions. Sheet size, margins and the general requirement that figures be clean and reproducible still apply. What changes is the color default, the petition requirement and the treatment of reference characters.

The two-copy provision in 1.165(b) is a paper-era requirement that predates electronic filing. It remains in the rule text, so practitioners filing through Patent Center should follow current USPTO filing guidance for how copies are handled electronically rather than assuming the paper practice has silently lapsed.

Color is required, and no petition is needed

This is the single most misunderstood point in plant practice, and it is worth stating precisely because the utility rule is so deeply ingrained.

In a utility or design application, 37 CFR 1.84(a)(1) makes black and white the norm: India ink or an equivalent that secures solid black lines. Color is accepted only after the Office grants a petition under 1.84(a)(2) explaining why color is necessary. That petition carries the fee set out in 37 CFR 1.17(h), a specification amendment containing the required reference to color, and one set of color drawings if filed through the USPTO patent electronic filing system, or three sets if not.

None of that applies to a plant application. Under 1.165(b) color is affirmatively required where color distinguishes the variety, and there is no justification petition to file. Filing one wastes the 1.17(h) fee and delays nothing usefully. Our broader guide to color patent drawings walks through the utility petition mechanics in detail if you are handling both filing types.

The practical failure runs the other way, though. A filer who treats the utility instinct as universal submits a careful greyscale rendering of a cultivar whose entire claim to distinctness is its color, and the disclosure is deficient on its face.

Photographs or artistic renderings: choosing the medium

Plant applications accept both photographs and artistic renderings, including watercolor. That is another inversion. In utility and design practice, 37 CFR 1.84(b)(1) treats photographs as ordinarily impermissible, allowed only where they are the only practicable medium — electrophoresis gels, tissue sections, in vivo imaging, ornamental effects. Our post on photographs in patent applications covers that narrow exception.

For plants, photography is routine and usually the better choice, because the question is fidelity to a living specimen rather than clarity of an engineered structure. A few practical rules govern which medium serves you:

• Photograph when the distinguishing characteristic is coloration, mottling, venation or any feature where an illustrator’s interpretation introduces doubt.
• Consider a rendering when the feature is structural — branching habit, fruit cross-section, leaf margin geometry — and a photograph would obscure it in shadow or foliage clutter.
• Shoot against a neutral, uncluttered background. A specimen photographed among other plants invites ambiguity about which plant is claimed.
• Include scale context where size is distinctive, and photograph the organ that actually differs: flower, fruit, foliage, bark or whole habit.
• Keep lighting neutral. Color casts from greenhouse sodium lighting or heavy post-processing can misrepresent the very characteristic you are claiming.

Whichever medium you pick, 1.165(a)’s “artistically and competently executed” standard still bites. The USPTO expects the figure to remain identifiable when reduced substantially for publication, so a soft-focus or badly exposed image is a real deficiency, not a stylistic quibble.

Why 35 U.S.C. 162 puts unusual weight on the figures

35 U.S.C. 162 provides that “No plant patent shall be declared invalid for noncompliance with section 112 if the description is as complete as is reasonably possible,” and that “The claim in the specification shall be in formal terms to the plant shown and described.”

Read those two sentences together and the role of the drawing becomes clear. Section 162 relaxes the written-description rigor of section 112 precisely because a living variety cannot be reduced to words the way a mechanism can. But the claim is to the plant shown and described — the figure is part of what the claim points to.

So the statutory accommodation is not a general lowering of standards. It shifts weight onto the visual disclosure. A plant patent has a single claim, and that claim reads on the specimen depicted. Weak figures do not merely risk a formalities objection; they narrow or undermine what the patent is understood to cover.

Where plant drawing sets go wrong

The deficiencies we are asked to correct in plant filings cluster tightly, and almost all are avoidable before filing:

1. Monochrome figures for a color-distinguished variety. The direct violation of 1.165(b), and the most common.
2. Photographs that do not match the color description. The specification typically characterizes color against a recognized horticultural color chart. When the printed figure and the chart designation disagree, the examiner has to resolve a contradiction in your own disclosure.
3. Missing the distinguishing organ. A set showing habit and foliage when the novelty is in the fruit discloses everything except the point.
4. Cluttered or inconsistent specimens. Different plants across figures, or backgrounds that make it unclear what is claimed.
5. Over-processed images. Saturation and contrast adjustments that flatter the specimen but misstate its actual coloration.
6. Reference characters added reflexively. Harmless, but they signal a set drafted from utility habit rather than to 1.165, and they are not required unless the examiner asks.
7. Resolution too low to survive reduction. The figure must stay identifiable at publication scale.

None of these are exotic. They are what happens when a plant set is prepared by someone applying utility instincts, which is exactly why the rule deserves a separate read.

If you are unsure whether a characteristic reads as distinctive in print, photograph it both ways and compare the reduced proofs before filing rather than after a deficiency notice arrives. Correcting a plant figure set later means new photography of a specimen that may no longer be in the same stage of growth.

What the plant patent drawings are filed alongside

The figure set does not stand alone, and the surrounding papers shape how it is read. A plant application has a structure of its own under 37 CFR 1.163 to 1.167, and each piece interacts with the drawing.

• The specification (37 CFR 1.163). It must contain a full botanical description of the variety and the characteristics that distinguish it, together with the origin and the manner of asexual reproduction. The botanical description is where a recognized horticultural color chart designation normally appears, and the figure has to agree with it.
• A single claim (37 CFR 1.164). A plant patent contains one claim, in formal terms to the plant shown and described. There is no claim set to fall back on if the figure is weak.
• Specimens (37 CFR 1.166). The Office may require specimens of the plant or its flower or fruit where they can be supplied in a condition admitting of examination.
• The oath or declaration. It must state that the inventor asexually reproduced the plant, which is what establishes stability and uniformity.

The interaction worth planning for is between the botanical description and the figure. Color in a plant specification is usually pinned to a published color chart, and an examiner comparing that designation against a printed photograph is doing a straightforward consistency check. If the greenhouse lighting shifted the image, or a saturation adjustment deepened a pink toward red, the two halves of your own disclosure disagree.

Two further points of practice matter commercially rather than procedurally. A plant patent runs 20 years from the filing date, the same term as a utility patent, and it confers the right to exclude others from asexually reproducing the plant or selling or using a plant so reproduced. And plant patent protection sits alongside, not instead of, Plant Variety Protection certificates for sexually reproduced varieties and ordinary utility patents for plant-related technology. Choosing the wrong instrument is a more expensive mistake than any drawing defect, so the filing decision should precede the photography.

How plant figures compare with utility, design and foreign practice

It helps to hold the three U.S. regimes side by side, because each treats the drawing differently:

• Utility (37 CFR 1.84). Black ink is the default. Color requires a granted petition and the 1.17(h) fee. Reference characters are mandatory and must be reconciled with the description. Solid black shading is generally not permitted except for bar graphs or to represent color.
• Design (37 CFR 1.152). The drawing is the claim. Scope is decided by the split between solid and broken lines, and surface shading is used to show contour. Color still runs through the 1.84(a)(2) petition route.
• Plant (37 CFR 1.165). Color required where distinctive, no petition, photographs routine, reference characters optional, and the figure carries disclosure weight that section 162 explicitly contemplates.

Internationally, the comparison is mostly instructive rather than directly applicable, because plant patents in the U.S. sense are unusual. Plant variety protection in Europe runs through the Community Plant Variety Office and national systems rather than the EPO, and Article 53(b) EPC excludes plant varieties as such from European patentability.

One European point is worth correcting while we are here, because it is still miscited constantly in drawing checklists. Rule 46 EPC, headed “Form of the drawings,” was deleted with effect from 1 February 2023. The form requirements moved into a Decision of the President of the EPO so they can be revised without amending the Implementing Regulations. Any checklist or vendor still citing Rule 46 EPC as live law is out of date.

Separately, since 1 October 2025 the EPO has accepted drawings filed electronically in color or greyscale where they are contrast-rich and clearly reproducible. The PCT was not changed to match — PCT Rule 11.13 still calls for black, uniformly thick, well-defined lines without colorings. For a full treatment of U.S. formalities see our guide to USPTO patent drawing requirements under 37 CFR 1.84.

Get Plant Patent Figures Prepared Correctly

PerspireIP prepares plant, utility and design figure sets to the rule that actually governs the filing — color plant photography and renderings to 37 CFR 1.165, utility sets to 1.84, design sets to 1.152, and monochrome PCT masters where a family travels. See our patent drawing services, or contact us with your specimen photographs and we will come back with a fixed fee and a delivery date.

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