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Difficult seed profiles

These species were identified by participants at Kew's 'Difficult' Seeds Project workshops as showing poor germination during initial testing and/or during re-tests after storage. Low germination may be due to inherent issues such as seed storage behaviour, dormancy or seed longevity, or handling and storage difficulties.

To share information on 'difficult' seeds and send your images to improve our resource, email us at difficultseeds@kew.org.

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Why are the seeds of this species difficult? The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.

Why are the seeds of this species difficult? The seeds may have physiological dormancy, which would have to be overcome before they will germinate. The seeds are relatively short-lived, so may not remain viable for a long time in storage.

Why are the seeds of this species difficult? The seeds have uncertain storage behaviour. They tolerate drying but seem to lose viability at low temperatures. Drying and cooling the seeds may induce dormancy.

Why are the seeds of this species difficult? The seeds may have physical dormancy, which can be overcome by scarifying the seeds and rehydrating them slowly before germination.

Why are the seeds of this species difficult? The seeds present no inherent problems in storage or germination. However, if they have not been properly dried and stored under optimal conditions, storage life and viability will be reduced.

Why are the seeds of this species difficult? The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.

Why are the seeds of this species difficult? Some species of the Poaceae family can produce a high proportion of empty seeds, which collectors and curators must take account of. The seeds may have physiological dormancy.

Why are the seeds of this species difficult? The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.

Send us an image of this species

Why are the seeds of this species difficult? This species has recalcitrant seeds, which have a high critical moisture content and will rapidly lose viability if they are dried. The seeds may also have physiological dormancy.

Why are the seeds of this species difficult? The seeds may have physical dormancy, which can be overcome by chipping the seed coat or removing covering structures to allow water uptake.

Why are the seeds of this species difficult? The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat. Removing the seed covering structures and incubating in the dark can have a beneficial effect on germination.

Send us an image of this species

Why are the seeds of this species difficult? The seeds are intermediate in storage behaviour. They can tolerate some drying, but will lose viability at low temperatures.

Why are the seeds of this species difficult? The seeds may have physiological dormancy, which would need to be overcome before they will germinate, by mimicking the seasonal patterns of the species' native habitat.

Send us an image of this species

Why are the seeds of this species difficult? The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.

Send us an image of this species

Why are the seeds of this species difficult? The seeds have recalcitrant seeds, which have a high critical moisture content and will rapidly lose viability if they are dried. The seeds may also have morphophysiological dormancy.

Why are the seeds of this species difficult? The seeds are intermediate in storage behaviour. They can tolerate some drying, but will lose viability at low temperatures. The seeds may also have physiological dormancy.

Why are the seeds of this species difficult? The seeds are likely to be intermediate in storage behaviour. The seeds may also have morphological or morphophysiological dormancy, which would have to be overcome before they will germinate.

Why are the seeds of this species difficult? The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.

Why are the seeds of this species difficult? The seeds may have physiological dormancy, which can be overcome by mimicking the seasonal patterns of the species' native habitat.

Why are the seeds of this species difficult? The seeds present no inherent problems in storage or germination. However, if they have not been properly dried and stored under optimal conditions, storage life and viability will be reduced.

Showing 21 - 40 of 163 results

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