Osmocote fertiliser tablet for aquatic plants, ochre and yellow granules compacted into a cone

Fertiliser tablets placed on the soil of a water lily pot, rhizome and pink flower beside it

Pink lotus buds above a large leaf, a pond plant grown in a pot

Osmocote fertiliser tablets for water lilies and lotus

Name: Osmocote fertiliser tablets for water lilies and lotus
Brand: Latour-Marliac
SKU: ACP004449
Price: 8.58 USD
Availability: InStock

$8.58

$2.86 × 3 with no fees Klarna.

These Osmocote fertiliser tablets with slow release feed water lilies, lotuses and marginal plants grown in pots. Their 14-8-11 formula is enriched with magnesium and trace elements.

They are pushed into the grow medium in the basket, to a depth of about 2 cm, at a rate of 3 tablets per 14 L pot, once per season in spring.

Ref. ACP004449·Fertilizer

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The summary

What you receive: a bag of 20 Osmocote slow-release fertiliser tablets for aquatic plants.
Formula: 14-8-11 with 2% magnesium and trace elements, geared towards flowering.
Dosage: 3 tablets per 14 L pot, pushed about 2 cm into the grow medium.
Per plant: 3 to 5 tablets for a water lily, 2 to 3 for a marginal plant, 6 to 9 for a lotus.
Frequency: one application at planting, then once per season in spring.
What it prevents: fertiliser dissolving into open water, where algae take it up before the plant does.

Osmocote 14-8-11 slow-release pellets, 3 per 14 L pot

An aquatic plant grown in a pot exhausts its grow medium within a season. These Osmocote tablets are pushed into the soil of the basket, in contact with the roots, and release their nutrients gradually, so a single application in spring feeds the plant for the whole season. Their 14-8-11 formula is enriched with magnesium and trace elements, and it promotes flower development.

💊 Placing it in the basket

You have nothing to take out of the water. Locate the grow medium in the basket, then push each tablet about 2 cm in with your finger, around the rhizome without touching it and rather in front of it, on the side where the shoots emerge. Allow 3 tablets for a 14 L pot, the usual size for a water lily basket, and apply them at planting and then once each spring. The cloudiness you stir up settles within a few minutes.

A water lily

Allow 3 to 5 tablets, depending on the size of the plant and the depth of water.

A pond-edge plant

Allow 2 to 3 pellets, as its needs are more modest.

A lotus

Allow 6 to 9 tablets per plant, at planting and then every spring.

The timing

Place the tablets in spring, when the first leaves are forming, then add nothing more.

A packet of 20 tablets covers 6 to 7 water lily baskets of 14 L, which is most of a private pond for a whole season. For lotuses, which need 2 to 3 times as much, the same packet feeds 2 to 3 plants. Push your tablets in once, note the date, and you will not need to come back until the following spring, since the slow release covers the entire growing season.

🐟 In shared water

Feed the potted plant rather than the pond water

A liquid fertiliser poured into a pond is diluted throughout the whole volume and benefits the algae first, which take it up faster than the roots do. A tablet pushed into the grow medium stays where it is useful. That is why it suits a hardy water lily or a Nelumbo nucifera lotus seedling in its second year.

In a system where fish and bacteria share the same water, this reasoning becomes a safety rule. A mineral input released into the open water changes what your tests measure and upsets a balance that took you weeks to achieve. Keep these tablets for pots of ornamental plants, and feed your crops with the split applications described in the article on fertiliser in aquaponics.

🧪 A 14-8-11 formula

The three figures give the content of the major nutrients: 14% nitrogen, 8% phosphorus expressed as P2O5 and 11% potassium expressed as K2O, plus 2% magnesium (MgO) and trace elements. Nitrogen supports the foliage, phosphorus and potassium support flowering, and magnesium is part of the chlorophyll molecule. This balance suits your water lilies as well as your lotus, the difference between the two lying in the number of tablets rather than in the formula.

Technical specifications

The formula and how to apply it

Shape: Osmocote slow-release pelletsTo be buried in the grow medium, never dissolved in the water
Formula: 14-8-11 + 2 MgOWith trace elements, formulated for flowering
Contents of the packet: 20 tabletsEnough to treat 6 to 7 baskets of 14 L
Reference dosage: 3 per 14 L potSpaced around the rhizome, without touching it
Planting depth: Around 2 cmPushed in by finger, without lifting the pot out of the water
Rhythm: 1 time per seasonAt planting, then every spring

To budget for separately

Potted plant: Water lily, lotus or marginal plantThese pellets can only be used in a grow medium that contains them
Heavy grow medium: Clay or garden soilA light soil would let the tablet float back up

In the box

20 Osmocote fertiliser tablets for aquatic plants

Formula, packaging and dosages recorded on 11/10/2026 from the product sheet and cultivation advice of the grower Latour-Marliac; dosage for marginal plants from a second European specialist.

Estimate your
delivery time

A packet of pellets goes out as a small parcel and is combined at no extra cost with the rest of your order. The exact amount is calculated in the basket.

Frequently asked questions

6 questions

6 key questions

How many pellets for a water lily, and for a lotus?

Plant	Number of tablets
Water lily	3 to 5 depending on the size of the plant
Marginal plant	2 to 3
Lotus	6 to 9 per plant
14 L pot, general guide	3

For a lotus that has gone several years without being divided, the dose falls at the upper end of the range.

Why not pour the fertiliser into the water?

Does the pot need to be taken out of the water for planting?

At what time of year?

Can it be used for plants outside the pond?

Is it suitable for an aquaponics system?

Keep it for ornamental plant pots, away from the system. A mineral input that is released into water shared by fish and bacteria skews your measurements and upsets a balance that takes a long time to achieve.

To feed crops in a system, the approach is different and relies on measured, monitored inputs, described in the article on fertiliser in aquaponics and in the one devoted to plant deficiencies.

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Osmocote fertiliser tablets for water lilies and lotus

The summary