When should I harvest?

Harvest when the stem turns brown and the gourd feels light.

Can I grow it in a pot?

Yes, but it needs a very large container and a sturdy trellis.

Plant guide

Bottle Gourd.

Lagenaria siceraria siceraria

Pronounced la-jen-AIR-ee-uh sik-er-AIR-ee-uh

Also known as Lagenaria siceraria siceraria

Calabash — Photo by 林孫鋒(Lin Sun Fong) (CC BY-SA) via iNaturalist

The bottle gourd is a fast growing annual vine famous for its unique, hard shelled fruits. It thrives in warm weather and needs plenty of space to sprawl. You will love watching these curious gourds develop throughout the summer.

Another photo of Bottle Gourd — Photo by Monics Paredes (CC BY) via iNaturalist

At a glance

Care level: Moderate
Plant type: Annual vine
Light: Full sun
Indoor light: Direct sun
Water: Every 2 to 4 days
Mature size: 15 to 30 feet
Growth rate: Fast
Hardiness: USDA 9 to 11
Bloom time: Mid to late summer

Care

Provide a sturdy trellis for the vines to climb to keep the fruit off the ground. Watch for powdery mildew on the leaves if the air circulation is poor. Ensure the soil stays consistently moist but not waterlogged during the peak growing season.

Watering: Keep the soil evenly moist, especially when the plant is actively producing fruit.
Feeding: Apply a balanced liquid fertilizer every two weeks during the active growing season.
Pruning: Trim back excessive growth to encourage side branching and better fruit production.
Repotting: As an annual plant, this is typically grown from seed in the ground or a large container each year.
Soil: Rich, well draining, loamy soil
Soil pH: 6.0 to 7.5
Temperature: 15 to 35°C
Humidity: 40 to 70%
Drought tolerance: Low
Lifespan: Annual, grows for one season.
Fragrance: Light
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes.
Plant growth slows significantly.
Soil dries out very quickly.

Safety

People: Mature gourds are not meant for human consumption and may cause gastrointestinal distress.
Children: The large, heavy fruits can pose a hazard if they fall, and seeds should be kept away from small children.
Contact allergens: The fuzzy stems and leaves can cause mild skin irritation in sensitive individuals.
Airborne allergens: Pollen may cause mild reactions in those with severe seasonal allergies.
Edibility: Young fruits are edible when cooked, but mature gourds are strictly for ornamental or functional use and can be bitter or toxic.

How to identify it

Large, soft, heart shaped leaves
White, star shaped nocturnal flowers
Smooth, green, bottle shaped fruits
Vigorous, climbing, tendril bearing vines

Height: 3 to 9m
Spread: 1.5 to 3m
Leaves: green, deciduous
Flowers: white, 5 to 10cm
Fruit: green, tan, Autumn

Problems to watch for

By symptom

Plant problems by symptom

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Growing it

Propagation: seed
When to plant: Spring
Overwintering: This plant is an annual and will die with the first frost, so collect seeds for next year.
In containers: It grows well in large containers of at least 20 liters with a strong support system.

Seed starting

Soak seeds in warm water for 24 hours.
Plant in pots indoors 4 weeks before the last frost.
Transplant into warm soil once danger of frost has passed.

Plant near a strong trellis to keep the heavy fruit off the ground.

Grows well with

Nasturtium · They help deter common garden pests.
Marigold · These flowers help repel harmful insects.

Keep away from

Potato · They compete for soil nutrients and space.

Similar species

Cucumber · They share similar growth habits and family traits.

Science

Family: Cucurbitaceae
Genus: Lagenaria
Order: Cucurbitales
Class: Magnoliopsida
Native range: Tropical regions of Africa and Asia.
Conservation: Not of conservation concern.

It is a vigorous climber that uses tendrils to scale trees and structures in its native tropical habitat.

Value to wildlife: nectar source
Pollinators: bees, moths
Uses: ornamental, crafts, culinary

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 8/9
Temperature: 8/9
Moisture: 6/9
Nutrients: 7/9

Taxonomy resolved against GBIF.

Questions people ask

When should I harvest?: Harvest when the stem turns brown and the gourd feels light.
Can I grow it in a pot?: Yes, but it needs a very large container and a sturdy trellis.

Where the name comes from

The genus name Lagenaria comes from the Greek word for flask, referring to the fruit shape.

Good to know

It is one of the oldest cultivated plants in the world.
The fruits can grow into many strange shapes.
It is often called the bottle gourd.
The flowers open at night to attract pollinators.

Keep your bottle gourd growing

This page is a general guide. Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked.

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.