🌱✗ Tested and false“Coriander only bolts (runs to seed early) in hot weather, like most herbs”
Cold spells and changing day length are named triggers for coriander bolting, not just heat. Hot, dry weather makes it worse, but isn't the only cause.
What to do: Don't assume a cool, damp Scottish summer protects coriander from bolting the way it protects dill. Choose a slow-to-bolt variety such as Calypso or Cruiser, and sow in small successional batches so a bolted round doesn't mean losing the whole crop at once.
In Scotland: This is a genuine exception to the pattern found for most herbs: a cooler Scottish summer, which helps dill avoid bolting, doesn't offer coriander the same protection.
1 source
- RHSBolting is caused by cold spells or day length changes, exacerbated by hot, dry weather
“Coriander is drought-tolerant like most herbs, so it doesn't need much watering”
Dry soil is itself named as a bolting trigger for coriander. It needs to be kept damp, not left to dry out the way Mediterranean shrub herbs like thyme or rosemary prefer.
What to do: Water regularly enough to keep the soil consistently moist, especially for container plants, which should be checked daily. Water in the early morning or evening rather than the heat of the day.
2 sources
- Gardener's WorldDry soil can cause plants to bolt; keep the soil damp
- RHSWater during prolonged dry spells to help prevent bolting
“Only the leaves of a coriander plant are worth using; the stalks should be discarded”
The stalk carries real flavour of its own, not just structural support for the leaves.
What to do: Snip coriander at the base of the stalk rather than picking leaves off individually, and use the stalk in cooking rather than composting it.
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- Gardener's WorldSnip leaves off at the base of the stalk, as the stalk is also full of flavour
“If coriander tastes soapy to you, it just wasn't fresh or well-grown — home-grown leaves won't have that taste”
A genome-wide association study of over 14,000 participants linked soapy-taste perception of coriander to a specific genetic variant (rs72921001) near a cluster of olfactory receptor genes, including OR6A2, which is highly sensitive to the aldehyde compounds that give coriander its characteristic smell. This is a receptor-level trait in the taster, not a property that changes with how fresh or well-grown the plant is — though the study is careful to note this one variant only accounts for a modest share of the variation in soapy-taste detection (heritability tagged by common SNPs around 8.7%), so genetics is clearly part of the story but not the whole of it.
What to do: If a family member insists they hate coriander no matter how it's grown, believe them — it's very likely a taste receptor difference, not a reflection on your garden.
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“A supermarket pot of coriander is grown the same way as a garden-sown plant, just smaller”
Overcrowded supermarket coriander pots are prone to fungal disease, a specific problem tied to how those pots are grown at high density rather than to coriander as a crop generally.
Our read This is RHS naming a specific failure mode of a retail product, not a controlled comparison against garden-grown plants, so it's reported here as a named risk rather than a tested verdict either way.
What to do: Treat a supermarket pot as a different growing situation from a garden sowing rather than a smaller version of the same thing. Splitting an overcrowded pot into individual containers on arrival, with more space and airflow, gives it a better chance than leaving it as bought.
1 source
- RHSOvercrowded supermarket coriander pots are prone to fungal disease
