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Tubergen’s Gem

Scarlet buds open to yellow stars. Mass them for a cheery sight that can repeat itself for a year or three. Tubergen’s Gem is a selection of Tulipa clusiana, which makes its home in Afghanistan and Tibet.

Bloom times are relative within the spring bulb season, which varies from place to place and year to year. They are intended to help you plan a sequence of bloom from Very Early season to Very Late season. About two weeks separate Early from Mid and Mid from Late. The start and duration of bloom is heavily dependent on the weather. Warm temperatures speed up growth and flowering; cold temperatures slow them down.

early
mid
late

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Specifications
USDA Zones
Design Criteria
Planting Guide
When to Plant

Item #	1026
Botanical Name	Tulipa clusiana
Bulb Size	5–6cm
Catalog Page (2020)	73

Flower Color	Yellow with Red
Bloom Time	Mid
Height	8-10 inches
Sunlight	Full (6+ hours sun per day)
Soil	Well-drained
Good for the South	✓

Depth of Planting Hole	4 inches
Spacing	3 inches apart
Density	11-12 per sq. ft.

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Planting Instructions

Tulips perform best in full sun but will tolerate a bit of shade (some afternoon shade will prolong flower life, especially in the South). They require well-drained soil. Treat tulips as annuals if you want a perfect display: After they flower, lift and discard the bulbs and replant fresh ones in the fall. In a less formal situation, you can leave the bulbs in place. The flowers will be uneven in size and height and generally much fewer in number, but that can have its own charm.

To encourage tulips to bloom again in future years we recommend that you:

Fertilize the bulbs when the foliage pushes through the soil in early spring. Don’t overdo it. A light scattering of a low-nitrogen fertilizer, preferably organic, is enough.
Remove the spent flowers as soon as the bulbs finish blooming. Snapping off the top 3 inches of the flower stem prevents seed formation and focuses energy instead on bulb growth.
Allow the foliage to wither completely before you remove it.
Avoid summer irrigation. Tulips prefer to be dry during their dormancy.

Spring-flowering bulbs must be planted in the fall. They need cool soil to make roots before the onset of winter. Cool fall weather arrives at different times from north to south and from high elevations to low.

Please note that the temperature of the soil lags behind the air temperature. You can generally plant later than the windows provided in this map. As long as the ground is not frozen, you can still plant.

The amaryllis are the last bulbs to arrive in the Colorblends warehouse. They are typically available for delivery toward the end of October. They can be planted upon receipt. They can also be stored in a cool, dry location for several weeks. Please note: Amaryllis bulbs may start growing before they are potted. If you decide to delay planting, open the bag(s) and set the bulbs on their roots so that the flower stems can grow straight up. And don't forget to mark your calendar or set a reminder to pot the bulbs.

Paperwhites can be potted upon receipt. They can also be stored in a cool, dry location for many weeks. Many people pot their bulbs in batches, one after the next, to keep the fragrance coming. It's not unusual for paperwhites to begin to sprout while in storage. The shoots emerge an inch or two and then stop, as though the bulbs realize they are getting ahead of themselves. The shoots often curl around the bulbs, pointing opposite gravity. After the bulbs are potted, the shoots straighten up.

Cold Limit	3a
Southern Limit	8b *
Western Limit	10b *
* Prechill in Zones 7b and warmer in the South, Southwest and California

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