One is an independently certified standard with a defined test; the other is an unregulated marketing word with no fixed graphic behind it.
One is certified, the other is a claim anyone can print. The Seedling means EN 13432 compostability verified by an independent certifier. A generic leaf or sprout labelled 'biodegradable' means only that the material will break down eventually — with no defined timeframe, no defined end state, no standard and no verification.
Both belong to the Packaging, recycling and disposal symbols system.
Drawn from the visual attributes recorded for each symbol. Only traits the two records disagree about are listed.
| Trait | Seedling logo | Biodegradable claim symbol |
|---|---|---|
| Built from | plants | plants and arrows |
| Symmetry | vertical | none |
| Seedling logo | Biodegradable claim symbol | |
|---|---|---|
| Visual form | One fixed, trademarked sprout design | No fixed design — a leaf, sprout, globe or arrow motif, varying by producer |
| Standard behind it | EN 13432, with defined disintegration conditions and a test window | None. 'Biodegradable' is an unregulated marketing term |
| Who verifies it | Independent certifiers — DIN CERTCO, TÜV Austria Belgium | Nobody. Entirely self-declared |
| What breakdown is guaranteed | Disintegration into water, biomass and CO2 under industrial composting conditions, within a defined period | Nothing specific — potentially months, potentially years, with no defined end state |
| Why the difference matters | A certified claim can be checked, and misuse of the trademark is actionable | A documented greenwashing risk: the word implies environmental benefit that the claim does not actually promise |
| Relationship (from Symbolwise's records) | Commonly confused with Biodegradable claim symbol — Both belong to the Packaging, recycling and disposal symbols system. | Commonly confused with Seedling logo — Both belong to the Packaging, recycling and disposal symbols system. |
The Seedling is a specific, certifiable trademark with a fixed graphic. The 'biodegradable claim symbol' is not a single symbol at all — it is a family of unstandardised marketing icons, so claims about its appearance are necessarily general rather than definitional.
Improved Seedling logo for industrially compostable products
European Bioplastics · retrieved 2026-07-27
Biodegradable vs Compostable Packaging
Compost Connect · retrieved 2026-07-27
Greenwashing vs. The Real Deal
Biodegradable Products Institute (BPI) · retrieved 2026-07-27
BPI is an industry/certification association with a direct interest in the compostable-vs-biodegradable distinction it describes — used only for the well-corroborated fact that the two terms are commonly confused, not as a neutral arbiter.
Biodegradable is close to meaningless on its own: almost everything degrades eventually, and the claim names no timescale and no conditions. Compostable states both. That gap is why unqualified biodegradability claims are restricted in several jurisdictions, and why a compostable mark is worth more than a biodegradable one.
These route to different places and are not substitutes. The recycling loop means the material can be reprocessed into new material. The Seedling means the item is certified to break down in an industrial composting facility — not in your garden compost, and not in recycling. Composting certified items in the recycling stream contaminates it, and vice versa.
The seedling certifies industrial compostability, which needs sustained high temperatures a garden heap never reaches. The home compostable mark certifies the much harder domestic case. An item carrying only the seedling put on a compost heap at home will still be there next year, which is why treating the two as interchangeable matters.
CE covers the European Economic Area; UKCA covers Great Britain. Both are the manufacturer's own declaration that a product meets the requirements applying to it, and for most product categories nobody grants or checks them. Neither is a safety certification or a mark of quality, which is how both are widely read. UKCA's territory is Great Britain rather than the whole United Kingdom, because Northern Ireland follows the EU regime.