necessary cold-periods in weeks
Below you’ll find an assortment of hyacinths and their necessary cold-periods in weeks for forcing indoors on water. Stated are the optimum cold-periods in weeks in 3 periods of the winter, after which the hyacinths can be forced indoors at room-temperatures to a proper length. These periods apply when the optimum temperatures during the cold/rooting period are about 9ºC (48ºF). Prior to this cold-period, the bulbs must have received the proper warmth storage period. Read more about forcing hyacinths at my page The Process of Forcing Bulbs.
| Hyacinth cultivar (picture) | Hyacinth cultivar (variety) | Colour | Start of forcing indoors in December, after a cold periode in weeks of about: | Start of forcing indoors in January, after a cold periode in weeks of about: | Start of forcing indoors in February or later, after a cold periode in weeks of about: |
|---|---|---|---|---|---|
 | Aiolos | white | 11 | 10 | 10 |
 | Amore | pink | 10 | 9 | - |
 | Anna Liza | purple | 10 | 9 | - |
 | Anna Marie | light pink | 10 | 9 | - |
 | Antartica | ivory white | 10 | 9 | - |
 | Apricot Passion | apricot | 11 | 10 | 10 |
 | Atlantic | dark blue | 10 | 9 | - |
 | Aqua | blue | - | 12 | 11 |
 | Blue Jacket | dark blue | - | - | 13 |
 | Blue Pearl | blue | 11 | 10 | 9 |
 | Blue Star | blue | 11 | 10 | 10 |
 | Blue Trophy | blue | - | 12 | 11 |
 | Carnegie | white | 13 | 12 | 11 |
 | China Pink | light pink | 11 | 10 | 10 |
| Delft Blue | blue | 11 | 10 | 10 |
 | Fondant | pink | 11 | 10 | 10 |
 | Gipsy Princess | light yellow | - | - | 12 |
 | Gipsy Queen | salmon orange | - | - | 12 |
 | Jan Bos | red | - | 11 | 10 |
 | Minos | blue | 10 | 9 | 9 |
 | Miss Saigon | purple | - | 11 | 10 |
 | Multiflora hyacinth | various | * | ||
 | Pink Pearl | pink | 11 | 10 | 9 |
 | Pink Surprise | light pink | - | 12 | 11 |
 | Polar Giant | white | - | 12 | 11 |
 | Purple Sensation | purple | 11 | 10 | 9 |
 | Purple Star | light purple | 11 | 10 | 10 |
 | Red Glory | red | 11 | 10 | 9 |
 | Scarlet Pearl | pink | 11 | 10 | 9 |
 | Siberia | white | - | 12 | 11 |
| Sky Jacket | light blue | - | - | 12 |
 | Splendid Cornelia | lilac | 10 | 10 | 9 |
 | Top White | white | 11 | 10 | 10 |
 | White Pearl | white | 11 | 10 | 9 |
 | Woodstock | dark purple | - | 11 | 10 |
 | Yellowstone | yellow | - | 11 | 10 |
[scroll to see whole table]
*
Multiflora hyacinths are specially treated big bulbs of certain varieties that produce more sprouts and flowers per bulb. The big main sprout is absent and a bunch of side bulbs will flower. The data for the given variety can be used. If the variety is not known it is best to use the data for Pink Pearl.
*
Not suitable for this period.
**
Multiflora hyacinths are specially treated big bulbs of certain varieties that produce more sprouts and flowers per bulb. The big main sprout is absent and a bunch of side bulbs will flower. The data for the given variety can be used. If the variety is not known it is best to use the data for Pink Pearl.
unique hyacinth (bulb vases) and handmade oil paintings
The unique collection of hyacinth vases (bulb vases) belonging to Wim Granneman is for sale, as well as his handmade collection oil paintings, inspired by the vibrant flower bulb fields of the Bulb District (Bollenstreek) in Holland. The vase collection includes many more than shown on the website and is available as a whole or in sets, for instance by country of origin. Parts of the vase collection and oil paitings have been exhibited in various museums.
Interested? Please don’t hesitate to get in touch.