Which gourd family plant is this? Work through the key
Answer the questions about the leaf, tendril, stem and flower, and get a confident answer on which cucurbit you are growing.
How is the leaf shaped?
What does the leaf surface feel like?
What do the tendrils look like?
What is the stem like?
What colour are the flowers?
Is there fruit on the vine?
0 of 6 answered
Why a leaf alone is not enough
Cucumber leaves are broadly triangular with three to five shallow lobes. Rockmelon leaves are rounder with barely any lobing. Pumpkin and zucchini leaves are deeply lobed with sharp points. Those descriptions sound distinct, and on a labelled plant they are.
The problem is that a young leaf, an old leaf, a shaded leaf and a stressed leaf all look different from the textbook. Cucumbers in full sun have deeper lobing than cucumbers in shade. A melon leaf that has been eaten by insects can look like anything.
Add the tendril and the stem, though, and the picture becomes clear, because those features do not vary the way leaves do.
The four features that actually separate them
| Plant | Leaf | Tendril | Stem | Flower |
|---|---|---|---|---|
| Cucumber | Triangular, 3-5 shallow lobes, rough and hairy | Simple, unbranched | Ridged, angular, almost square, hairy | Yellow |
| Zucchini | Deeply lobed, sharp points, stiff | Branched | Thick, round, hairy | Yellow |
| Pumpkin | Deeply lobed, star-like, coarse | Branched | Thick, round, hairy, often hollow | Yellow |
| Rockmelon | Round to heart-shaped, barely lobed, soft | Branched | Round, fine hairs | Yellow |
| Watermelon | Deeply lobed, grey-green, softly hairy | Branched | Round, hairy | Yellow |
| Bitter melon | Deeply cut, almost fern-like, thin | Simple | Thin, angular, hairy | Yellow |
| Bottle gourd | Broad, soft, velvety, rounded lobes | Branched | Angular and ridged, hairy | White |
| Chayote | Large, broad, shallowly lobed, smooth | Branched | Smooth, ridged, climbing strongly | Pale green |
How to use the key
- Start with the leaf shape, because it narrows the field fastest. Deep lobing with sharp points means pumpkin or zucchini. Shallow lobing and a triangular shape means cucumber. Round with barely any lobing means melon.
- Then find a tendril. Look near the growing tip, where the vine is reaching out. Cucumber and bitter melon tendrils are simple, curling in one spiral. All the others branch and fork.
- Then look at the stem. Ridged and angular, almost square in places, means cucumber. Thick, round and hollow means pumpkin. Smooth and round means melon or chayote.
- Then the flower colour. Yellow covers cucumber, zucchini, pumpkin and most melons. White means bottle gourd. Pale green means chayote.
- If you have fruit, it settles everything. But by then you probably already know.
When the answers conflict
They will sometimes conflict, and it is worth knowing why. A young seedling has not developed its lobing yet. A stressed plant in drought will have smaller, harder leaves. A plant grown in deep shade is softer and less deeply lobed than the same variety in sun.
When that happens, trust the tendril and the stem over the leaf. Tendril branching and stem shape are structural, and they do not change with growing conditions the way leaf lobing does.
And if it is a seedling you are looking at, wait. Another two weeks will settle it more reliably than any amount of squinting at a leaf.
The one that is not a cucurbit
One plant gets confused with cucurbits more than any other, and it is a weed: fat hen. It has a soft, grey-green, mealy leaf that looks vaguely like a young gourd leaf, and it appears in the same beds.
The difference is obvious once you know it. Fat hen does not climb, has no tendrils at all, and the leaves grow in a different pattern up a soft green stem. If there is no tendril anywhere on the plant, it is not a cucurbit.
Every year I get the same message from a reader: "the label fell off my vine, what is it?" And every year the honest answer is that a photo of one leaf is usually not enough.
Cucurbit leaves overlap so heavily that a single leaf can honestly be a cucumber or a melon. What settles it is the tendril, the stem and the flower, and none of those are in a photo of a leaf.
So this page is a key. Answer the questions about the leaf, the tendril, the stem and the flower, and you will get a confident answer, because those four features together are reliable where a leaf alone is not.
Frequently Asked Questions
Use the leaf, the tendril, the stem and the flower together, because a single leaf is rarely enough. Cucumber has triangular leaves with shallow lobes, simple unbranched tendrils and ridged angular stems. Pumpkin and zucchini have deeply lobed leaves and branched tendrils.