Four Star Culture Guide - 2019 - 33

LOBELIA
Laguna®

NUTRITION
pH: 5.8 - 6.2
EC: (2:1 extraction method) .6 - .9
Constant feeding at 150ppm - 200ppm nitrogen with a fertilizer
selected for grower's water quality and soil mix is recommended.
TEMPERATURE
Rooting out: 65 - 72 F
Growing on: 65 - 72 F
Holding: 50 - 60 F
WATERING
Maintain moderate soil moisture. Allow the soil to cycle from
moist to dry. Avoid both severe dry downs/wilting and long
periods of wet soil, especially at cooler temperatures.
TIMING
4" - 5"/Grande™: 4 - 6 weeks with one 104 Liner plant.
6"/1GL Royale™: 5 - 7 weeks with one 104 Liner plant.
8": 5 - 9 weeks with one to two 104 Liner plants.
10" - 12" Hanging Basket: 9 - 12 weeks with three to five
104 Liner plants.
Laguna® Compact Blue with Eye may benefit from one additional
week of crop time than the others.
PLANTING
The 104 Liner plants should be planted into a well-drained soil
mix selected to match individual water quality and fertilizer
blends. Water in thoroughly without saturating and keep a
constant moderate moisture level for the first seven to 10 days
to establish roots. Plants have already been pinched and no
additional pinching should be needed, except in larger material
at planting or a second pinch on plants for large containers.
This second pinch can be given usually four to six weeks after
planting.
LIGHT/LIGHTING
These plants should be grown in a high light area of the
greenhouse for optimal flowering and plant development. They will
flower and finish fine under normal growing weather conditions for
peak week sales. For earlier crop scheduling, daylength extension
lighting should be provided to ensure success.

GROWTH REGULATORS
A light spray application of Sumagic® (uniconazole) at 5ppm -
10ppm can be applied for Laguna Lobelia, if required. A 1ppm
Bonzi® (paclobutrazol) drench is also effective. Use PGRs only
as needed with Compact Blue with Eye, and at the lower
recommended rates. Caution should be taken when using
Sumagic or Bonzi with Laguna Compact Blue with Eye, as it is
quite responsive to these products.
For ease in growing, watering, and applying PGRs, Compact
Blue with Eye can be grown with some separation from
other Laguna Lobelia. It often requires less watering and PGR
applications than the other Lobelia. Of the other Lobelia, Laguna
White is probably the most vigorous and is a good indicator
plant for PGR needs.
PEST and DISEASE MANAGEMENT
There should be little instance of disease if basic cultural
guidelines are followed. Proper temperature, light levels, and
water management will eliminate most disease issues. A
broad spectrum fungicide such as Banrot® (etridiazole plus
thiophanate-methyl) can be applied at transplant if desired. In
poor growing conditions, Botrytis, Powdery Mildew or INSV can
develop. Scout for Whiteflies, Thrips, and Aphids.
OUTDOOR GROWING SCHEDULE
Lobelias can be grown outdoors in the second earliest spring
conditions (approximately frost to 28 F, or mid- to late April in
Michigan), if frost protection is provided. This recommendation
is based on average spring weather and should be adjusted for
unseasonably severe or unseasonably mild conditions.
OTHER TIPS
* Proper soil pH levels should be maintained. If soil pHs reach
5.5 or lower, dark foliage color and plant stunting/distortion
can occur.
* Cooler temperature and moderate moisture levels combined
with high light will minimize PGR needs.
* Provide good air movement and space to minimize disease
issues.
* Do not schedule for early season production without
considering lighting for daylength manipulation.
* Growing too wet and cool, especially in poor weather
conditions, can cause "purpling" of the foliage.

The rates and chemicals listed are based on our southeast Michigan growing conditions, and are not recommended for nationwide application.
Please adjust the rates and spray applications to your location and facility.

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