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Gladiolus Bulbs Classification Guide
Worlds Finest Glads
Miniature Glads
All-American Glads
Gladiolus Bulb Culture
Planting: Glads do well in any good garden soil that drains well and that
will receive at least half day of sun, The soil should be prepared by spading,
digging and/or roto-tilling and the corms planted as a rule of thumb to a depth
of about 3 times the diameter of the corm. Plant shallower in heavy soils and
deeper in sandy soils. A pesticide bulb dust or liquid drench is recommended
before planting. A 11/2” bulb would then be planted about 4 1/2” deep. Plant
bulbs from 4 to 8 inches apart according to available space.
Cultivating: Avoid deep cultivation so that you will prevent root injury.
Frequent shallow cultivation is good for aeration and climbing weeds. After
plants are about 1 foot tall, hilling or tilling soil against plants will help
prevent them from falling over. Recommended amounts of herbicides such as
Treflan, Surfian, Dual II, Deverinol, Post and others can help with weed
control.
Watering: Glads do not like a wet, soggy soil, but do like plenty of moisture
as they near flowering. A well drained soil with an irrigation (watering) source
during dry periods is ideal. Heavy clay loam soils certainly need less watering
than the lighter sandy loam soils. After the blooming season little or no
watering is usually best for controlling diseases as the plants develop new
bulbs and bulblets for the next season.
Fertilizer: Generally the more sandy the soil, the more fertilizer is
required. Glads do not like a fertilizer high in nitrogen. Therefore use a
5-20-20 or 3-12-12(NPK) or a fertilizer with similar analysis at a rate used for
garden vegetables. If organic sources are used, make sure they are very well
decomposed. Trace minerals are not usually needed for glads grown on average
garden soils.
Flower Cutting: Glads are there to be cut as much as any other cut flower.
Slide a small cutters knife down along the base of the spike to the desired stem
length, cut half way thru the stem and then break the flower spike away from the
plant. Try to leave as many leaves on the plant as possible to provide food for
the developing bulbs and bulblets. Flowers cut with 1 or 2 open florets will
usually open very well and cool store. Fresh water with floral preservatives can
add to the vase life of most flowers including gladiolus.
Digging and Storage: Glads should be dug in the fall about 6 to 8 weeks after
flowering. When digging the stem should be removed by cutting or breaking as
close to the bulb as possible. Excess soil is best removed from the bulbs by
washing them over a screened surface. After digging, bulbs should be allowed to
dry with good ventilation at room temperature for about 4 weeks. At that time
the old coons can be easily separated at the abscission layer from the new corms
and the old corms and root discarded. Then store corms at as near 40 degrees
Fahrenheit as possible in open containers with good ventilation until spring
planting. Freezing temperatures will destroy the bulbs. Bulb dust or liquid
drenches applied after digging will protect bulbs from insects and diseases
during the storage months.