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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 can be overcome by mimicking the seasonal patterns of the species' native habitat.

Kew's 'Difficult' Seeds project has put together a series of species profile pages for species identified by workshop participants as possessing seeds that are difficult to handle, store or germinate. The terms and the methods referred to in the species profile pages are explained below.

Why are the seeds of this species difficult? Some species of the Asteraceae 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.

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

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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 physical dormancy, which can be overcome by scarifying the seed coat to allow water uptake. 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 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 physical dormancy, which can be overcome by scarifying the seed coat to allow water uptake and encourage germination.

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

Why are the seeds of this species difficult? Some species of the Asteraceae family can produce a high proportion of empty seeds, which collectors and curators must take account of. Seeds of this species may have physiological dormancy. 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 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 have physical dormancy, which can be overcome by scarifying the seed coat to allow water uptake and encourage germination.

Why are the seeds of this species difficult? The seeds have physical dormancy, which can be overcome by scarifying the seed coat to allow water uptake and encourage germination.

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 species 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. Wild-growing sub-species may produce a high proportion of empty seeds, which collectors and curators must take account of.

Why are the seeds of this species difficult? Some seeds may exhibit a sensitivity to desiccation or susceptibility to freezing. The seeds may have morphological dormancy, which would have to be overcome before they will germinate.

Showing 61 - 80 of 162 results

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