Foxglove Seeds
Tips on How to Grow Foxglove (Digitalis)
Time Frame when plants are receptive to flower initiation: 8 � 12 leaves
are present.
Flowering Type: Facultative Long Day Plant (secondary) � long days enhance
flowering.
Specific Flowering Mechanism: High light enhances flowering.
PLUG CULTURE
- Germination � Optimum conditions for seedling development that begins the day
the crop is sown until cotyledon expansion.
- Expect radicle emergence in 3 � 4 days.
- Cover: Do not cover seed.
- Media: pH: 5.8 � 6.2
- EC: 0.5 � 0.75
- Light: Light is necessary for germination. If utilizing a chamber, providing a light
source of 10 � 100 foot candles will improve germination and
reduce stretch.
Temperature: 65� � 70�F (18� � 21�C) until cotyledon expansion.
- Moisture: Medium (2) until radicle emergence. Then begin alternating
between moisture levels moist (3) and medium (2). Allow media to approach
level (2) before re-saturating to level (3).
- NOTE: Saturated media will discourage
the roots from penetrating into the media.
- Humidity: Days 1 � 6 maintain 90 � 95% or until radicle emergence and initial
roots penetrate the media. On day 7, reduce to 40 � 70%.
- Dehumidify: Provide horizontal airflow to aid in drying down the media
through evapotranspiration, allowing better penetration of oxygen to the roots.
- Finish Bulking/Flower Initiation � Optimum conditions during the vegetative
period, beginning at transplant, needed for the root to reach the edge of the container,
AND to make the plant receptive to flower initiation.
- Media: � pH: 5.8 � 6.2
- EC: 0.75 � 1.5
- Light: Time to flower and the number of flowers produced increase proportionally
with light levels. Though classified as a shade plant, Digitalis can handle
high light conditions with adequate moisture and cool temperatures.
>li>Temperature: 45� � 55�F (8� � 12�C) nights are optimal though crop will
tolerate a range of 40� � 65�F (4� � 16�C). Under short days, cool temperatures
can benefit flowering response.
GARDEN SPECIFICATIONS
Light: Partial shade to full sun
USDA Hardiness Zone: 5
Garden Height: 3.5 � 4 feet (1 � 1.5 m)
Garden Width: 24 � 30 inches (60 � 75 cm)
In trials, plants grown in greenhouses with additional lights exhibited stretched
habits and loose flower spikes. Crops grown cool in protected cold frames
will produce compact plants with good lateral development of secondary
spikes.
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