Physiological
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How to Grow Wild Hyacinth (Camassia scilloides) from Seed
This spring ephemeral requires multiple growth cycles of warmth followed by chilling before reaching flowering size.
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How to Grow Scarlet Painted-cup (Castilleja coccinea) from Seed
Although a generalist hemiparasite, the choice of host plant makes a substantial difference when growing in containers.
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How to Grow Sweet Grass from Seed
This fragrant grass germinates poorly at room temperature, so an alternating temperature regime mimicking spring conditions is recommended.