Yes, and abundantly. This species produces plenty of seed and naturalises easily in wetland areas that suit it. If you want to contain it, cut the flower stalks as soon as flowering ends, before the seed capsules open.

Sagittaria montevidensis seeds – giant arrowhead seeds for pond and marsh

Sagittaria seeds close-up – aquatic plant seeds with white flowers for pondside

Sagittaria seeds packaging – arrowhead seed packet for pond landscaping

Arrowhead seeds, Sagittaria montevidensis

Name: Arrowhead seeds, Sagittaria montevidensis
Price: 900.0 RSD
Availability: InStock

900.00 RSD

300.00 RSD × 3 with no fees Klarna.

These seeds produce Sagittaria montevidensis, an arrowhead with large arrow-shaped leaves and white flowers marked with a wine-coloured blotch.

This shallow-water plant is grown under only 2.5 to 15 cm of water. Hardy in USDA zones 8 to 11, it needs shelter in cold regions.

Aquatic plant

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The summary

What you receive: a packet of Sagittaria montevidensis seeds, giant arrowhead.
Water: only 2.5 to 15 cm above the grow medium, as this is a marginal plant, not a deep-water one.
Seedling: you sow on a water-saturated grow medium, in the light, for germination in 10 to 11 weeks.
Space to allow: 60 to 120 cm tall by 30 to 60 cm wide, with petioles that can exceed 75 cm.
Hardiness: USDA zones 8 to 11, to be protected or overwintered under cover in cold regions.
Flowering: 2.5 cm white flowers with a wine-red blotch, from summer to early autumn.

Sagittaria to sow, a shallow-water plant for 2.5 to 15 cm of water

Delta arrowhead is easy to spot from a distance, with its arrow-shaped leaves, broad and upright on long, spongy stalks. Its white flowers, 2.5 cm across, have a wine-red blotch at the base of the petals and are borne in whorls on flower stems that rise above the foliage.

💦 A few centimetres of water

Water depth decides where you plant it. An arrowhead placed on the bottom of a pond under 40 cm of water will not establish: it belongs in the marginal zone, where the bottom rises. If your pond has no shelf, a simple tub placed on submerged concrete blocks does the same job, and you can adjust the height to the centimetre.

The water level

The water depth ranges from 2.5 to 15 cm above the grow medium, no more.

Positioning

Arrowhead can be placed on a pond edge, a shallow shelf, a pond ledge, or in a large shallow tub.

The plant

It stands 60 to 120 cm tall, forming a clump 30 to 60 cm wide.

Light

Full sun or partial shade, both suit this species.

🌱 A seedling in water

Unlike most seeds, this one germinates better on a water-saturated medium, in almost airless conditions. Sow flat, on the surface, on a fine, waterlogged compost that you keep level with the water, and leave it all in the light. Emergence takes 10 to 11 weeks, with a published success rate of around half the packet.

A watertight-based tray to flood the seedling

To keep the water level with the compost during the 10 to 11 weeks of germination, sow in a germination kit with independent trays. Each tray sits on a watertight base that you fill with water, and its vented lid limits evaporation between checks. As the trays are separate, the arrowhead stays submerged without imposing the same regime on the neighbouring vegetable seedlings, which need compost that is merely moist.

In winter, the question to settle first

This species is hardy in USDA zones 8 to 11, which in France covers only the mildest areas. Depending on your region, you will therefore need to lower the pot beneath a deeper layer of water or bring it into a bright, frost-free space. The seasonal calendar reminds you to time these moves by water temperature and by the frosts in your region rather than by the name of the month.

🌊 A marginal plant for the pond

At the edge of a stocked pond, this very shallow water depth has a practical advantage: the roots sit in the nutrient-rich water while the foliage stays entirely above the water, without shading any of the surface. You will find the other marginal plants in the aquatic plants collection, and the crops that genuinely feed a tank are covered on the page about plants to grow in aquaponics. The plant also produces a great many seeds and self-seeds easily: if your pond borders a natural wetland, cut back the faded flower stems before the seed pods open.

Technical specifications

The plant and its seedling

Botanical name: Sagittaria montevidensisWetlands of North and South America
Height: 60 to 120 cmSpongy petioles that can exceed 75 cm on their own
Water depth: 2.5 to 15 cmAbove the grow medium, it is a shallow-water plant
Flower: White, 2.5 cmWine-red blotch at the base of the petals, in whorls
Seedling grow medium: WaterloggedUnlike most seedlings, excess water is actually wanted here
Germination period: 10 to 11 weeksSeedling kept level with the water and in the light

To budget for separately

Height support: Concrete blocks or bricksTo hold the pot 2.5 to 15 cm below the surface
Winter shelter: A bright, frost-free roomIn regions where the water freezes deep down

In the box

1 packet of Sagittaria montevidensis seeds

Height, water depth, flowering and hardiness recorded on 20/09/2026 from a reference horticultural database. Germination time and conditions taken from a published study on propagating wetland plants, covering the genus Sagittaria.

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Frequently asked questions

6 questions

6 key questions

Exactly what water depth above the pot?

Allow between 2.5 and 15 cm, never more. This is the figure that sets this plant apart from a water lily or a lotus: it belongs to the zone where the bottom rises, not to the floor of the pond.

If your pond has no shelf, stand the pot on submerged concrete blocks and adjust their number until you reach the right height. It can be set to the centimetre and corrected in a minute.

What should I do with seeds that haven't sprouted after two months?

Why submerge the seedling?

Is it frost-resistant?

Does it self-seed?

How many plants around the edge of a pond?

Growing calendar

Guidance for mainland France. This species needs a long germination in spring and a wintering decision in autumn, depending on how mild your region is.

Stage
Sowing on saturated grow medium3 months	Sowing on saturated grow medium: no	Sowing on saturated grow medium in February	Sowing on saturated grow medium in March	Sowing on saturated grow medium in April	Sowing on saturated grow medium: no	Sowing on saturated grow medium: no	Sowing on saturated grow medium: no	Sowing on saturated grow medium: no	Sowing on saturated grow medium: no	Sowing on saturated grow medium: no	Sowing on saturated grow medium: no	Sowing on saturated grow medium: no
Germination3 months	Germination: no	Germination: no	Germination: no	Germination in April	Germination in May	Germination in June	Germination: no	Germination: no	Germination: no	Germination: no	Germination: no	Germination: no
Transplanting into a pot3 months	Transplanting into a pot: no	Transplanting into a pot: no	Transplanting into a pot: no	Transplanting into a pot: no	Transplanting into a pot in May	Transplanting into a pot in June	Transplanting into a pot in July	Transplanting into a pot: no	Transplanting into a pot: no	Transplanting into a pot: no	Transplanting into a pot: no	Transplanting into a pot: no
Placing in the shallows3 months	Placing in the shallows: no	Placing in the shallows: no	Placing in the shallows: no	Placing in the shallows: no	Placing in the shallows: no	Placing in the shallows in June	Placing in the shallows in July	Placing in the shallows in August	Placing in the shallows: no	Placing in the shallows: no	Placing in the shallows: no	Placing in the shallows: no
Flowering3 months	Flowering: no	Flowering: no	Flowering: no	Flowering: no	Flowering: no	Flowering: no	Flowering in July	Flowering in August	Flowering in September	Flowering: no	Flowering: no	Flowering: no

KeySowing on saturated grow mediumGerminationTransplanting into a potPlacing in the shallowsFlowering

This month October

Growing guidance

Sowing period: February to AprilEarly, because germination takes more than two months
Seedling grow medium: WaterloggedLevel kept flush with the compost, in the light
Germination period: 10 to 11 weeksWith stragglers appearing several weeks after the first ones
Transplanting: One plant per potPot set in a few centimetres of water
Water depth: 2.5 to 15 cmThis is the figure that determines the position
Adult height: 60 to 120 cmSpongy petioles sometimes exceeding 75 cm
Clump width: 30 to 60 cmSpace the plants at least this distance apart
Flowering: Summer to early autumnWhite flowers 2.5 cm across with a wine-red blotch
Aspect: Sun or partial shadeBoth suit this species
Hardiness: USDA zones 8 to 11Overwintering is needed outside the mildest regions

What you need to know

Set the water depth with concrete blocks rather than hunting for the right level. Two or three submerged blocks give a stable base and you can adjust the level to the centimetre, which matters when the useful range runs from 2.5 to 15 cm.
Sow on a grow medium that is truly saturated. It goes against instinct after years of sowing vegetable seedlings, but this species germinates in a poorly aerated medium, and compost that is merely damp gives poorer results.
Date the tray. With 10 to 11 weeks to germinate, a seedling judged too early is often thrown away when it was about to sprout.
Cut back the flower stalks as soon as flowering has finished if your pond borders a natural wetland. The plant produces a lot of seed and self-sows easily.
Decide on overwintering in September, not in November. Depending on your region, the pot will go under a deeper layer of water or be brought indoors, and both call for a little preparation.
Enjoy the foliage held entirely out of the water. Its roots sit in the water, its leaves do not, so it dresses a bank without shading any of the pond surface.

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Arrowhead seeds, Sagittaria montevidensis

The summary