We intend to drop silica gel when our current supply runs out, probably in 2019. Silica gel can be used to dry seeds for long-term storage or to dry flowers. In most climates, seeds can be air-dried in a covered, well-ventilated space; however, in moist climates, it may be necessary to use additional drying methods such as curing seeds in a dehumidified space or drying seeds with silica gel. When used as directed, silica gel dries seed from typical 12% moisture content to a desired 3-5% moisture content. Note: Legumes should not be dried below a 6% moisture content. To dry seed, place equal weights seed and silica gel together in an airtight jar for seven days. A muslin bag or other cloth can be used to keep seed and gel separate. Silica gel can be used many times and re-dried in the oven. We carry 2-5mm color-indicating silica gel beads that contain phenolphthalein as a moisture indicator at 100 ppm. The gel is orange when completely dry and changes to dark green as it absorbs moisture. We have been alerted that most blue-to-pink indicating silica gels contain cobalt chloride, which might pose a risk of cancer; the primary concern is with dust inhalation. Silica gel can have a drying effect on skin, eyes, and mucous membranes, so caution is recommended.

Instruction sheet is included. To see the instruction sheet, follow this link: Drying Seed with Color Indicating Silica Gel

To see the Material Safety Data Sheet, download this PDF >>
  • Item # 85113D

Seed-Saving Supplies

For information on how to save seeds, see the Seed-Saving section of our Growing Guides page, and also our Links page. See our About us pages information on how and why we support seed-savers.