Four Star Culture Guide - 2019 - 49

PETUNIA CONTINUED
GROWTH REGULATORS
As required, either a light spray of Sumagic at 5ppm - 10ppm or
a 1ppm - 3ppm Bonzi drench can be applied to control growth.
Treatments are usually made to smaller containers seven to
14 days after planting. Treatments to larger containers can be
made when a desired "pre-finished" size is attained (two to four
weeks before scheduled finish). Watch for the "softening" look
and lighter green appearance of new growth as an indication
for PGR treatment needs. In more northern areas, the lower
rates should be used as a starting base, while in more southern
areas, the higher rates will probably be needed. Other materials
such as Topflor® (flurprimidol) and Piccolo® (paclobutrazol) can
be used at rates that correspond with the degree of treatment
recommended for Sumagic or Bonzi.
Cooler growing temperatures, high light levels, proper spacing,
and drier growing practices can be very helpful at managing
plant size. Supernova treated plants should require fewer PGR
treatments than 104 Liners.
When using Supernova Liners, please refer to the
Supernova Culture Guide for specific PGR and growing
temperature recommendations. Florel® (ethephon) is not
recommended for use with Supernovas, except possibly
with Nemesia.
PGR requirements can vary greatly by variety and the plants
should be grown - if possible - in the following groups for best
performance.

2) Black Cherry®, Blue Skies, Bordeaux™, Honey™, Latte™,
Limoncello®, Picasso in Purple®, Priscilla®, Royal Magenta®,
Royal Velvet®, the trailing Supertunias, Vista® Fuchsia and
Vista® Paradise, have average vigor and will/may need a PGR
treatment. PGR treatments may need to be delayed on Black
Cherry and Limoncello until active growth is seen and then
group 2 PGR recommendations can be followed.
3) Bermuda Beach®, Lovie Dovie™, all Charms, and Really Red
are more reactive to PGRs than other Vista varieties.
Please use the flowering guide below as a further reference to
help group plants together for easier production.
PEST and DISEASE MANAGEMENT
Pests are not much of an issue with Supertunias. Proper
growing environments and watering practices should be
followed to avoid Botrytis and various Stem or Root Rots.
OUTDOOR GROWING SCHEDULE
Most Supertunia Petunias can be grown outdoors in the earliest
spring conditions (approximately frost to 25 F, or early- to midApril in Michigan), if frost protection is provided. Black Cherry,
Bordeaux, the Charms, Limoncello, Trailing Rose Veined and
Trailing Strawberry Pink Veined should remain indoors and
moved outdoors in the third earliest spring conditions (light frost
or late April/mid-May in Michigan). These recommendations are
based on average spring weather and should be adjusted for
unseasonably severe or unseasonably mild conditions.

1) Giant Pink, 'Lavender Skies', Vista® Bubblegum®, Vista®
Silverberry and White are the most vigorous varieties and will
require the most PGR attention.

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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Four Star Culture Guide - 2019

Table of Contents for the Digital Edition of Four Star Culture Guide - 2019

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Four Star Culture Guide - 2019 - Cover1
Four Star Culture Guide - 2019 - Contents
Four Star Culture Guide - 2019 - 1
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