Factors that affect flowering compiled by John Erwin



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FACTORS THAT AFFECT FLOWERING
Compiled by John Erwin,

Department of Horticultural Science, University of Minnesota,

305 Alderman Hall, 1970 Folwell Ave., St. Paul, MN 55108

Office: 612-624-9703; Cell: 612-385-6863; erwin001@umn.edu





Common Name

Latin Name

Photoperiodic Response Group

Irradiance Response Group

Vernalization Response Group

Dormancy Requirement

Comments

Flowering maple

Abutilon x hybridum

DNP













Achillea

Achillea aegyptiaca ‘Taygetea’

FLDP




FV







Achillea

Achillea clypeolata x ‘Taygetea’, ‘Anthea’, ‘Moonshine’

FLDP

OLDP for Anthea



FI

FV/None




Vernalize Moonshine for 6 weeks. Vernalize other for 15 weeks. It is suspected that this time could be reduced to 8-12 weeks. Flowers in 6 weeks when grown at 68oF.

Achillea

Achillea filipendulina ‘Cloth of Gold’

OLDP




OV




Vernalize for 10 weeks. It is suspected that this time could be reduced to 8-12 weeks

Achillea

Achillea filipendulina x ‘Gold Plate’

FLDP




FV




Vernalize for 15 weeks. It is suspected that this time could be reduced to 8-12 weeks

Achillea

Achillea filipendulina x clypeolata ‘Coronation Gold’

FLDP




FV




Vernalize for 15 weeks. It is suspected that this time could be reduced to 8-12 weeks

Achillea

Achillea millefolium x ‘Taygetea’, ‘Appleblossum’, Fireland’, ‘Galaxy’, Hope’, ‘Paprika’, ‘Terra Cotta’, ‘Red Velvet’

FLDP/OLDP

FI

FV




Vernalize for 15 weeks. It is suspected that this time could be reduced to 8-12 weeks. Flowers in 6-9 weks when grown at 68oF.

Achillea

Achillea millefolium x ‘Summer Pastels’

OLDP




FV




Vernalize for 15 weeks. It is suspected that this time could be reduced to 8-12 weeks

Achillea

Achillea ptarmica ‘The Pearl’

FLDP




FV




Vernalize for 15 weeks. It is suspected that this time could be reduced to 8-12 weeks

Achillea

Achillea tomentosa ‘King Edward VIII’

DNP




FV




Vernalize for 15 weeks. It is suspected that this time could be reduced to 8-12 weeks

Achimenes

Achimenes hybrids

DNP













Monkshood

Aconitum napellus







OV




Cool at 36oF for 10 weeks followed by 8 weeks at 28oF.




Acroclinium roseum

OLDP













Agastache, Anise hyssop

Agastache x ‘Blue Fortune’

FLDP

FI







Flowers in 7-8 weeks when grown at 68oF.

Agastache

Agastache rugosa ‘Honey Bee Blue’

FLDP

FI

-




Flowers in 7-8 weeks when grown at 68oF.

Ageratum

Ageratum houstonianum

FLDP
















Agrostemma githago

OLDP













Hollyhock

Alcea rosea

FLDP













Agrimony

Agrimonia eupatoria

DNP




OV







Wheatgrass

Agropyron smithii

OLDP













Cloudgrass

Agrostis nebulosa

OLDP













Bentgrass

Agrostis palustris

OLDP
















Ajuga ‘Bronze Beauty’, ‘Chocolate Chip’ Golden Beauty’ and others

DNP

II

OV




Bulk first. Vernalize for 6 weeks. Plants will flower in 4-5 weeks when grown at 68oF.




Alchemilla mollis

DNP

FI

OV




Larger than 72-cell required for flowering. Plants will flower in 6 weeks when grown at 68oF.




Allium ampeloprasum

?LDP










17-20oC Temperatures required for flower induction/initiation

Common Onion

Allium cepa

FSDP/DNP




FV










Allium neapolitanum







?V




9-17oC optimal




Allium roseum







?V




9-17oC optimal




Allium sphaerocephalon

?LDP










A 17-20oC Temperatures required for flower induction/initiation




Allium unifolium







?V




9-17oC optimal

Foxtail

Alopecurus pratensis

OLDP













Alstroemeria, Peruvian lily

Alstroemeria hybrids

FLDP




OV




Alstroemeria flowering is dependent on media temperature. Flowering occurs when the rhizome is maintained at 60oF or cooler.

Amaranthus

Amaranthus caudatus

FSDP













Tumbleweed

Amaranthus graecizans

FSDP













Amaranthus

Amaranthus hybridus ‘Pygmy Torch’

DNP













Ragweed

Ambrosia elatior

SDP
















Ammi majus

OLDP













Anemone, blue wood anemone

Anemone coronaria

DNP-OLDP




FV




Flowering is greatest when day and night temperatures are 58-65oF and 41-50oF, respectively.

Pimpernel

Anagallis arvensis

OLDP

FI










Pimpernel

Anagallis tenella

OLDP

FI

OV







Pineapple

Ananus comosus

FSDP













Beardgrass

Andropogon gerardi

SDP
















Anemone hupehensis

OLDP




OV







Dill

Anethium graveolens ‘Mammoth’

OLDP













Broomsedge

Andropogon virginicus

FSDP













Dog fennel

Anthemus cotula

FLDP













Kangaroo Paws

Anigozanthos flavidus

FLDP













Kangaroo Paw

Anigozanthos flavidus x manglesi

DNP













Kangaroo Paw

Anigozanthos manglesii

FSDP













Kangaroo Paw

Anigozanthus pulcherrimus

DNP













Kangaroo Paw

Anigozanthos rufus

DNP













Chervil

Anthriscus cerefolius







?V







Anthurium, Flamingo flower

Anthurium andraeanum

DNP
















Anthurium scherzerianum

DNP













Snapdragon

Antirrhinum majus

FLDP













Celery

Apium graveolens

DNP




OV







Columbine, Johnquill

Aquilegia species

DNP/FLDP

II

OV




Bulk first. Many have an 8-10 leave juvenile period. Vernalize 6-12 weeks. Plants will flower in 5-8 weeks when grown at 68oF.

Columbine

Aquilegia flabellata ‘Cameo’, ‘Mini Star’

DNP

II

OV




Vernalize for 6-9 weeks. Plants will flower in 4 weeks when grown at 68oF. Need to be bulked for about 6 weeks before induction.

Columbine

Aquilegia flaballata ‘Mini Star’

DNP




OV




Vernalize for 6-9 weeks

Columbine

Aquilegia x hybrida ‘Crimson Star’

DNP

II

OV




Vernalize 6-9 weeks. Best if bulked for 3-6 weeks after transplant. Plants will flower in 4 weeks when grown at 68oF.

Columbine

Aquilegia x hybrida ‘Musik series’

DNP

II

OV




Vernalize 6-9 weeks. Best if bulked for 3-6 weeks after transplant. Plants will flower in 5 weeks when grown at 68oF.

Columbine

Aquilegia x hybrid Origami Blue’

DNP

II

OV




Vernalize for 5 weeks. Plants will flower in 4 weeks when grown at 68oF.

Columbine

Aquilegia x hybrida Songbird series

DNP




OV




Vernalize 6-9 weeks

Columbine

Aquilegia vulgaris ‘Winky Series’







OV




Vernalize for 10+ weeks

Arabidopsis

Arabidopsis thaliana

FLDP




FV







Armeria

Armeria x hybrida ‘Dwarf Ornament Mix’

DNP




OV




Vernalize for 10 weeks

Armeria

Armeria latifolia

DNP














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