Four Star Culture Guide - 2019 - 7

ARGYRANTHEMUM CONTINUED
GROWTH REGULATORS
When being grown from Supernova Liners, either a light spray
of Sumagic® (uniconazole) at 5ppm - 10ppm or a 1 - 2ppm
Bonzi® (paclobutrazol) 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 after planting). Watch for the "softening" look and
lighter green appearance of new growth as an indication for
PGR treatment needs.
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 few PGR
treatments compared to the crops finished from standard 104
plants.
Plants grown from 104 Liners will require at least one drench
at 1 - 3ppm Bonzi or possibly one to two light sprays of
Sumagic at 5ppm - 10ppm. 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. Repeated PGR treatments can compound to
cause flowering delay.
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.

PEST and DISEASE MANAGEMENT
Pest and disease practices should be followed as with most
crops. Lower leaf spotting/rots due to improper watering is
the most common disease issue. In poor growing conditions, a
fungicide spray may be needed to prevent or cure leaf/stem soft
rots. Copper-based materials are very helpful in these situations.
OUTDOOR GROWING SCHEDULE
Butterfly Argyranthemum 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. If no frost
protection is provided, they can be moved outdoors during the
second earliest spring conditions (approximately frost to 28 F,
or mid- to late April in Michigan). These recommendations are
based on average spring weather and should be adjusted for
unseasonably severe or unseasonably mild conditions.
OTHER TIPS
Supernova treated liners are highly recommended for most
grower uses. Supernovas are not recommended or required for
baskets and large containers. But, many growers are beginning
to use them for early hanging basket and upright needs. Growth
habit and timing may be different from 104 Liners, but flowering
time and "retail ready" containers can be produced in portions
of the growing season when not possible from 104s. For best
combination planting performance, vigor considerations should
be made of all plants used, if mixing Supernova treated plants in
with non-Supernova treated plants. If mixing Supernova and 104s
in combination plantings, a pre-plant drench of Sumagic or Bonzi
to the 104 Liner used may be helpful to even out plant growth.

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.

Four Star Culture Guide - 2019

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