Minnesota Flower Growers Bulletin - January,
Caladium tuber grades and their
respective sizes. ................................
crn or greater
4.5 - 3.5 inches 11.5 - 9.0 cm
3.5 - 2.5 inches 9.0 - 6.5 cm
2.5-1.5 inches 6.5 - 4.0 cm
1.5 - 1.0 inches 4.0 - 2.0 cm
New crop tubers (harvested in August) are
with proper storage, tubers virtually year round.
Tubers should be inspected upon receipt for signs of chilling injury and/or physical damage upon delivery
Tubers should be firm. Tubers exposed to chilling temperatures are often rubbery to the touch. When cut, the tuber should be free of milky-white areas and brown streaks which may indicate the presence of fungal
number is increased in any one of 3 ways: pinching, cutting tubers into pieces, or planting tuber upside-down.
1) pinching is
Pinching- As with other crops, used to increase the number of
shoots on a plant. In the caladium, the main bud, or eye, is the dominant bud. If this bud is removed before tubers are planted
(referred to as scooping) shoots will develop.
2) Large tubers may be cut in pieces, allowed to suberize, placed back together, and
Tubers may be planted upside
down. number shorter,
Besides causing an ,of shoots emerging, and the finished
increase in the the shoots are plant is fuller.
Volume 40, Number 1
However, production time is increased.
Growth Reaulators: in 2,000 ppm Ethephon for 2
Soaking tubers hours improves
uniformity and increases shoot number. Forcing time is unaffected by Ethephon soaks.
Plantina well drained
tubers - and high in
Medium should be organic matter. The
Tubers should be planted 2 -3 cm (1 inch) below the soil line. The number of tubers per pot is determined by the pot size and the desired final plant size. Usually 1 mammoth or jumbo tuber, 3 #l's , or 4 -5 #2's are planted per 6 inch pot. One #1 or 2 #2's are also be planted per 4 inch pot. Caladiums can also be started in flats and transplanted to pots to reduce the space requirement during production.
SDacinq -Pots may initially be placed pot-
should be spaced far enough apart good air movement and little shading.
Support -Caladiums generally do not require support.
h a v e 1 )
insects -Caladiums do not, in
However, root aphids and mealy bugs may feed on tubers during storage. Mites, aphids, mealy bugs, white flies, red spider mites, and
lepidopterous larvae may feed
2) Diseases - Tubers always be inspected upon receipt.
with discolored areas or
the surfaces should be discarded.
Tubers may be attacked by many pathogens
Fus a r i u m , R h i z o c t o n ia,
Schlerotium, and Erwinia.
A warm fungicide
dip (50oC or 122oF) for 10 - 30 minutes prior to potting helps to control fungal pathogens. In addition, a regular preventative fungicide drench is recommendedon a monthly basis.
Dasheen Mosaic Virus (DMV) has been found in many 'Candidurn' cultivars. A DMV infected plant may not show symptoms of