Hornwort

Eastern Box Turtle

Terrapene carolina

Eastern Box Turtles are primarily terrestrial omnivores and hornwort is not referenced in any source as a recommended food for this species. While it is non-toxic, it falls outside the typical 50% plant / 50% animal protein diet outlined by ReptiFiles, and its nutritional contribution for this species is unknown.

Red-eared Slider

Trachemys scripta elegans

Hornwort (Ceratophyllum demersum) is a well-established, non-toxic aquatic plant widely used with Red-eared Sliders; Tortoise Trust endorses aquatic plants and salad as freely available for this species. It provides natural foraging enrichment and constitutes appropriate plant matter for the 75% vegetable component in adult diets per ReptiFiles.

Yellow-bellied Slider

Trachemys scripta scripta

Yellow-bellied Sliders share the same omnivorous dietary pattern as Red-eared Sliders, and Tortoise Trust explicitly recommends aquatic plants as freely available for aquatic turtles of this type. Hornwort is non-toxic and supports the vegetable-heavy portion of the adult diet.

Painted Turtle

Chrysemys picta

Tortoise Trust specifically names painted turtles alongside Red-eared Sliders as species for which aquatic plants should be freely available. Hornwort is non-toxic and is a natural component of the aquatic environment, supporting the increasing plant matter requirement in adult painted turtles.

Russian Tortoise

Agrionemys horsfieldii

Hornwort is an aquatic plant not found in the natural arid/semi-arid range of the Russian Tortoise, and no source consulted lists it as appropriate for this species. As a terrestrial herbivore requiring high-fiber, low-moisture foraging plants, aquatic macrophytes are not a recognized dietary component and should be excluded.

Leopard Tortoise

Stigmochelys pardalis

Leopard tortoises are grass-heavy grazers and no reviewed source includes aquatic plants such as hornwort in their dietary recommendations. Tortoise Trust notes this species is susceptible to goitrogens and metabolic disruption from inappropriate foods, and caution is warranted with unvalidated plant species.

Red-footed Tortoise

Chelonoidis carbonarius

Although Red-footed Tortoises are omnivores with broader dietary tolerance, hornwort is an aquatic plant not referenced in any source for this species. Insufficient data exists to establish safety for a terrestrial chelonian, and it is not a natural dietary component in their range.

Greek Tortoise

Testudo graeca

No source consulted lists hornwort as suitable for Greek (spur-thighed) tortoises, and Tortoise Trust notes this species is particularly vulnerable to goitrogens and dietary disruption. Without established safety data for terrestrial chelonians, this aquatic plant should not be offered.

Hermann's Tortoise

Testudo hermanni

Hornwort does not appear in any Mediterranean tortoise dietary guidance from The Tortoise Table or Tortoise Trust, and it has no place in the natural diet of Hermann's Tortoise. Its aquatic origin and unknown nutritional profile for terrestrial herbivores warrants exclusion pending further data.

Sulcata Tortoise

Centrochelys sulcata

Sulcata tortoises require an extremely high-fiber, grass-dominant diet and hornwort is an aquatic macrophyte entirely outside their natural dietary range. No source consulted supports its use for this species, and its high moisture content is inconsistent with Sulcata nutritional requirements per ReptiFiles.