Faustrime finger-lime hybrid
Hybrid involving Citrus australasica and limequat ancestry — exact formula requires provenance
A pearl-filled citrus related to finger lime, but a hybrid in its own right: vigorous, thorny and often long-fruited. Do not sell it as a pure finger-lime cultivarA variety produced through selection or cultivation, distinct from the wild original plant..
Faustrime is an Australian-bred hybrid, reported as involving Citrus australasica (finger lime) and limequat ancestry, although the full commercial parent formula remains disputed. It was selected for cropping and pearl-filled fruit, producing long fruit and often a heavier crop than some finger limes, with pale to green juice pearls and marked acidity. The crucial distinction is that it is not a pure finger-lime cultivar; it should not be passed off as the species. The shrub is vigorous and densely thorny.
Pearl texture and aroma are variable; parentage and cold tolerance must be checked against a documented accession or breeder record. Keep it distinct from finger lime as a species and compare its reported ancestry with limequat rather than treating a sales formula as proof.
Reliable checks before you buy
A useful pearl-fruited hybrid — not a pure finger lime
Choose Faustrime when you want a potentially freer-cropping pearl fruit. Compared with finger lime as a species, it is often described as longer-fruited and more productive, with pale to green pearls and vivid acidity. The honest distinction is not to confuse it with a pure finger-lime cultivar: it is a hybrid with its own behaviour, and pearl texture and aroma vary.
Remain cautious where evidence conflicts: the exact formula, nomenclature and hardiness need accession-level confirmation from a collection, breeder or supplying nursery. Choose the rootstockThe root and base onto which a variety is grafted to give it vigour or resistance. for the site only after the exact graft combination has been documented by the nursery.
| Your conditions / aim | What to verify | Reason — and trade-off |
|---|---|---|
| Vigour in an open mix | Named stock and documented Faustrime compatibility | A vigorous stock may suit container production. ⚠ Compatibility cannot be assumed. |
| Restricted size and relative cold tolerance | Trifoliate stock only where water and pH suit it | It can restrain growth. ⚠ It dislikes alkaline conditions and does not harden the scion against severe frost. |
| Alkaline or saline conditions | A locally proven tolerant stock | Soil tolerance matters. ⚠ Do not prescribe one stock without a nursery trial for this uncommon hybrid. |
| Keep in mind | Confirm identity; do not conflate | Verify accession and local behaviour: this is a hybrid, not a pure finger lime. |
A Faustrime year: movable container and protected winter
In Britain, use a movable container and a bright, frost-free winter position. Flowering and ripening move with accumulated warmth; the marks below are observation windows, not a yield promise.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Plant / repot as active growth begins | ||||||||||||
| Keep bright and frost-free under cover | ||||||||||||
| Move outdoors gradually; shelter from scorching sun | ||||||||||||
| Possible flowering | ||||||||||||
| Possible late-season harvest | ||||||||||||
| Feed citrus while actively growing |
Keep Faustrime traceable and healthy
Its hybrid identity
Record that it is a hybrid, not a pure finger lime, together with the supplier, accession or clone and the variability expected in its pearls.
Unexpected pearls or aroma
Variation in pearl texture and perfume can belong to this hybrid; compare seasons before diagnosing a disorder.
High light without abrupt scorch
Give high light, steady warmth and even root moisture, while hardening foliage off gradually before full summer exposure.
Verify rather than assume hardiness
Protect from frost until the exact material has local evidence, and handle the very thorny canopy with gloves and eye protection.
Read the symptom, trace the cause, correct and prevent
Faustrime shares the problems of protected pearl-fruited citrus; natural variation in pearls is not itself a disease.
| What you see | Likely cause | Correct | Prevent |
|---|---|---|---|
| Variable pearls or aroma | Normal hybrid or accession variation | Assess each harvest and adapt the use | Buy traceable material and record each season |
| Dry or bleached patches in summer | Sun scorch after abrupt exposure | Shade at peak heat and acclimatise in stages | Harden off gradually and filter extreme midday sun |
| Yellow leaves with greener veins | Iron chlorosisYellowing of the foliage caused by poor iron uptake, often linked to chalky soil. promoted by high pH, hard water or wet roots | Correct irrigation and drainage; use suitable chelate only after diagnosis | Use open compost and monitor irrigation-water alkalinity |
| Cottony deposits or fixed scales on stems and leaf backs | Mealybugs or scale insects under cover | Isolate, remove by hand and use a labelled treatment if necessary | Inspect before moving indoors and ventilate winter quarters |
| Fine webbing and pale stippling | Glasshouse red spider mite in warm, dry air | Shower foliage where practical and correct the dry environment | Avoid hot stagnant winter air and inspect leaf undersides |
Keep treatments proportionate: clean foliage, good airflow and balanced nutrition come first. For an uncertain or regulated citrus pest, follow current UK plant-health guidance.
Bright pearls for finishing
Like finger lime, Faustrime is used to release its juice pearls, then scatter them for vivid acidic bursts. It is a finishing condiment best added fresh at the last moment to preserve texture. Its aromatic zest is useful too. Reports of freer cropping make it interesting where more pearls are wanted, provided their natural variability is accepted.
What standards do — and do not — say
Faustrime has no dedicated UK marketing-size scale.
- Market category: no dedicated scale is applied; sound pearls and traceable identity matter more than diameter.
- Still to verify: exact parent formula, nomenclature and hardiness remain accession-level questions.
Do not publish a generic yield: clone, rootstock, age, protection, water and season all change performance. Measure the actual plant.
What British growers most often ask
Is Faustrime a finger lime?
No. It is a pearl-fruited hybrid involving finger-lime ancestry, but published and commercial parent formulas conflict. It must not be sold as a pure Citrus australasica cultivar.
Are its pearls consistent?
Not necessarily. Pearl texture, colour and aroma can vary with the material and season; assess the actual harvest.
Is it hardy outdoors in Britain?
There is no responsible generic guarantee. Keep it frost-free until the exact clone has credible local trial evidence.
How is it used?
Use the acidic pearls as a last-minute finishing condiment and the zest for aroma. Do not turn reported productivity into a guaranteed crop.
Evidence and provenance control
Evidence checked 4 August 2026. Conflicting parent formulas are retained as a provenance issue rather than resolved by guesswork.
- Fundació Todolí Citrus — Faustrime: exact cultivar profile and hybrid terminology; read alongside other breeding records. Parentage caveat: the full commercial formula remains disputed and is not treated as settled.
- Peer-reviewed study of Faustrime fruit volatiles: identifies Faustrime as a trigeneric hybrid involving Microcitrus australasica and Fortunella material.