Flowering and Seed Collection Dates of Maine Plants

Flowering and Seed Collection Dates of Perennials, Shrubs, and Trees Growing in Maine.

Field guides are wonderful tools, but they all too often lack regionally specific¬†information. This table was devised to help folks gauge when flowering and seed/spore set could be expected for the southern Maine, USA area. I personally compiled this data from my field observations. Use this guide to help plan your growing season. Maybe you really want to catch liverwort in bloom for the first time this year. Or perhaps you would like to try growing out some royal fern spores and need to know when to collect them. You can use the information to plan a landscape that blooms sequentially, maximizing foraging opportunity for our imperiled pollinators. You can use this information for all kinds of applications……….


SpeciesCommon nameSpore Collection DateObserved Location
Dryopteris goldianaGoldie's fernJuly 11Alfred, Maine
Gymnocarpium dryopterisOak fernAugust 4Alfred, Maine
Polystichum acrostichoidesChristmas fernJuly 11Alfred, Maine
Osmunda cinnamomeaCinnamon fernJune 15Alfred, Maine
Osmunda claytonianaInterrupted fernJune 8Alfred, Maine
Osmunda regalisRoyal FernJune 1Alfred, Maine


SpeciesCommon nameFlowering TimeSeed CollectionObserved Location
Acorus americanaSweet flagJune 3NAAlfred, Maine
Actaea pachypodaDolls eyesMay 31August 16Alfred, Maine
Allium tricoccumRamps, Wild leeksJuly 12NAWade, Maine
Aquilegia canadensisWild comlumbineMay 28June 24Alfred, Maine
Aralia nudicaulisWild sarsparillaMay 10July 5Alfred,Maine
Aralia racemosaSpikenardJuly 5August 8Alfred,Maine
Asarum canadensisWild GingerApril 25NAAlfred,Maine
Asclepias incarnataSwamp milkweedJuly 21September 25Alfred,Maine
Asclepias exaltataPoke milkweedJuly 1NAAlfred,Maine
Asclepias syriacaCommon milkweedJuly 21September 15Alfred,Maine
Aster novae angeliaeNew Engand asterOctober 8November 20Alfred,Maine
Aster macrophyllaBig leaved AsterJuly 28October 14Alfred,Maine
Aster umbellatusFlat topped AsterAugust 30October 14Alfred,Maine
Aureolaria pedicularisFern leaf false foxgloveAugust 25October 16Alfred,Maine
Calopogon tuberosusGrass PinkJuly 6NALimington,Maine
Caltha palustrisMarsh marigoldMay 20NAAlfred,Maine
Chelone glabraTurtle headAugust 25October 9Alfred,Maine
Coptis trifoliumGoldthreadMay 12NAAlfred,Maine
Cornus canadensisDogtooth violetNAJuly 28Alfred,Maine
Corydalis sempervirensPale corydalisJune 5June 24Alfred,Maine
Clintonia borealisBluebead lillyMay 29August 15Alfred,Maine
Cypripedium acualePink ladyslipperMay 29NAAlfred,Maine
Cypripedium parviflorumYellow ladyslipperJuly 12NAWade, Maine
Dalibarda repensFalse violetJuly 12September 13Alfred,Maine
Drosera rotundafoliaSundewJuly 28NAAlfred,Maine
Epigaea repensMayflower, Trailing arbutusApril 30July 1Alfred,Maine
Eupatorium perfoliatumBonesetJuly 21October 14Alfred,Maine
Eupatorium maculatumJoe pye weedAugust 10OctoberAlfred,Maine
Gaultheria procumbensWintergreenJuly 21NovemberAlfred,Maine
Geranium maculatumWild geranium, CranesbillApril 24June 5Alfred,Maine
Goodyera tesselataCheckered Rattlsnake PlantainJuly 28NAAlfred,Maine
Gentiana linearisClosed gentianAugust 25NAAlfred,Maine
Hepatica nobilis var americanaLiverwortApril 24June 5Alfred,Maine
Hydrastis canadensis**GoldensealMay 15August 1Alfred,Maine
Iris versicolorWild irisJune 3September 1Alfred,Maine
Jeffersonia diphylla**TwinleafMay 6July 5Alfred,Maine
Liatris scariosa var novae-angelaeLiatrisAugust 24September 24Kennebunk, Maine
Lilium philadelphicumWood lillyJuly 12NAAlfred,Maine
Lobelia cardanalisCardinal flowerAugust 14September 19Alfred,Maine
Lythrum salicariaPurple loosestrifeMay 21NAAlfred,Maine
Maianthemum canadenseMayflowerMay 29SeptemberAlfred,Maine
Mitchella repensPartridge berryJune 23NovemberAlfred,Maine
Monotropa unifloraIndianpipeJuly 28NANA
Panax quinquefoliusAmerican ginsengJuly 11September 10Alfred,Maine
Podophyllum peltatumMayappleMay 28NAAlfred,Maine
Pogonia ophioglossoidesRose pinkJuly 11NAGreenville, Maine
Polygala paucifoliaFringed polygalaMay 28NAAlfred,Maine
Ranunculus gmnelliiSmall yellow water crowfootJuly 10NAPresque Isle, Maine
Rhodiola roseaRoserootJuly 28Aug/SeptAlfred,Maine
Sanguinera canadensisBloodrootApril 27June 23Alfred,Maine
Sarracenia pupureaNorthern Pitcher plantJune 17SeptemberAlfred,Maine
Schizachyrium scopariumLittle blue stem grassAug 4Aug 31Alfred,Maine
Similacina racemosaFalse Solomons sealMay 29Sept 1Alfred,Maine
Solidago argutaForest goldenrodAugust 14October 14Alfred,Maine
Solidago bicolorSilverrodAugust 31Sept/OctAlfred,Maine
Solidago canadensisCommon goldenrodAugust 1Sept/OctAlfred,Maine
Solidago caesiaBlue stem goldenrodSeptember 15October 14Alfred,Maine
Solidago puberulaDowny or Dusty GoldenrodAugust 26OctoberAlfred,Maine
Solidago sempervirensSeaside goldenrodOctober 10September 26Kennebunkport,Maine
Solidago rugosaRough stemmed goldenrodSeptember 1October/NovAlfred,Maine
Spiranthes lucidaShining ladies tressesJuly 11NAWade, Maine
Trillium erectumStinking BenjaminMay 11August 15Alfred,Maine
Vaccinium macrocarponCranberryJuly 11NAGreenville, Maine

Shrubs and Vines

SpeciesCommon nameFlowering TimeSeed CollectionObserved Location
Acer pennsylvanicumMoosewoodMay 11September 26Alfred, Maine
Acer spicatumMountain mapleJune 5, 2008August 22Alfred, Maine
Alnus rugosaSpeckled alderApril 5October 12Alfred,Maine
Amelanchier canadensisShadbushMay 12June 23Alfred,Maine
Amelanchier laevisSmooth shadbushMay 8July 4Alfred,Maine
Amelanchier stoloniferaThicket shadbushMay 15July 4Alfred,Maine
Aronia melanocarpaBlack chokeberryMay 20July 28Alfred,Maine
Carpinus carolinianaBlue beechNASeptember 3Alfred, Maine
Celastrus orbiculataOriental bittersweetJune 10July 28Alfred,Maine
Cephalanthus occidentalisButtonbushJuly 21November 9Alfred,Maine
Chamaedaphne calyculataLeatherleafNAOctober 14Alfred,Maine
Clethra anifoliaSummersweetAugust 11October 30Acton, Maine
Comptonia peregrinaSweetfernMay 2July 21Alfred,Maine
Cornus alternifoliaPagoda dogwoodMay 31July 4Alfred, Maine
Cornus amomumSilky dogwoodNASeptember 19Alfred, Maine
Corlylus americanaHazlenutApril 5September 3Alfred,Maine
Corylus cornutaBeaked hazlenutApril 5August 5Alfred,Maine
Diervilla loniceraBush honeysuckleJune 10September 1Alfred,Maine
Dirca palustrisLeather woodMay 9NAAlfred,Maine
Gaylussacia baccataHuckleberryMay 29July 28Alfred,Maine
Ilex verticillataWinterberryJune 18October 5Alfred,Maine
Ilex laevigataSmooth winterberryNAOctober 3Sanford, Maine
Juniperus communisJuniperMay 29(pollen release)NAAlfred,Maine
Kalmia angustifoliaSheep killJune 14NAAlfred, Maine
Kalmia latifoliaMountain laurelNANovember 10Sanford, Maine
Lindera benzoinSpicebushMay 2September 19Alfred,Maine
Lonicerea canadensisFly honeysuckleMay 2July 4Alfred,Maine
Lyonia ligustrumMaleberryJune 24October 14Alfred,Maine
Myrica galeSweet galeNASepetember 15Alfred,Maine
Myrica pennsylvanicumWax berryNAOctober 8Bath,Maine
Nemopanthus mucronatusMountain HollyMay 12July 21Alfred,Maine
Ostrya virginianaHop hornbeamMay 20September 3Alfred,Maine
Parthenocissus quinquefoliaVirginia creeperNAOctober 16Alfred,Maine
Polygonatum cuspidatumJapenese knotweedAugust 31NAAlfred,Maine
Prunus maritimaBeach plumNAAugust 11Ogunquit, ME
Prunus virgininaChokecherryMay 20July 4Alfred,Maine
Quercus ilicifoliaScrub oakMay 20September 24Kennebunk, Maine
Rhododendron canadenseRhodoraMay 20October 14Alfred,Maine
Rhododendron maximumGreat laurelJuly 1October 21Sanford, Maine
Rhus typhinaStaghorn sumacJuly 1November 9Alfred,Maine
Rosa multifloraMultiflora roseJune 3NAAlfred,Maine
Rubus allegheniensisCommon blackberryJune 13NAAlfred,Maine
Rubus flagellarisNorthern dewberryJune 14July 16Alfred,Maine
Rubus idaeusRed RaspberryJune 13July 16Alfred,Maine
Rubus odoratusPurple flowering raspberryJune 28August 25Alfred,Maine
Rubus occidentalisBlack raspberryJune 13July 16Alfred,Maine
Sambucus canadensisElderberryJuly 12August 25Alfred,Maine
Sambucus racemosaRed elderberryMay 12July 11Alfred,Maine
Spiraea lattifoliaSpiraeaJune 28November 10Alfred,Maine
Spiraea tomentosaSteeplebushJuly 16September 26Alfred,Maine
Vaccinium angustifoliumLowbush blueberryMay 11June 30Alfred,Maine
Vaccinium corymbosumHighbush blueberryMay 11July 21Alfred,Maine
Vaccinium myritilloidesVelvet leaf blueberryNAJuly 28Sanford, Maine
Viburnum acerifoliumMaple leaf viburnumJune 3September 10Alfred,Maine
Viburnum dentatumArrowoodJune 13August 16Alfred, Maine
Viburnum lantanoidesHobblebushMay 12September 1Alfred, Maine
Viburnum lentagoNannyberryMay 31September 19Alfred, Maine
Viburnum nudum var. cassinoidesWitherodJune 10August 31Alfred, Maine
Vitis labruscaFox grapeJune 18August 31Alfred, Maine
Vitis ripariaRiver grapeNAOctober 6Damariscotta, Maine

Native Trees

SpeciesCommon nameFlowering TimeSeed CollectionObserved Location
Acer rubrumRed mapleApril 5May 30Alfred, Maine
Acer sacharinumSilver mapleMar 31May 26Alfred, Maine
Acer saccharumSugar mapleNASeptember 7NA
Betula allegheniensisYellow birchMay 1NAAlfred, Maine
Betula lentaSweet birchMay 1NAAlfred, Maine
Betula papyriferaPaper birchNAOctober 20Alfred, Maine
Betula populifoliaGrey birchMay 11October 14Alfred, Maine
Carya ovataShagbark hickoryMay 12September 29Alfred, Maine
Castanea dentatumChestnutNASeptember 29Alfred, Maine
Chamaecyparis thyoidesAtlantic white cedarNANAAlfred, Maine
Fagus americanaAmerican beechMay 13September 3Alfred, Maine
Fraxinus americanumWhite ashMay 12NAAlfred, Maine
Nyssa sylvaticaBlack tupeloJune 18NAAlfred, Maine
Pinus rigidaPitch pineNAOctober 8Alfred, Maine
Pinus strobusWhite pineJune 3NAAlfred, Maine
Populus tremuloidesQuaking aspenApril 5NAAlfred, Maine
Prunus serotinaBlack cherryMay 28August 10Alfred, Maine
Prunus pennsylvanicumFire cherryMay 12NAAlfred, Maine
Quercus albaWhite oakMay 12September 29Alfred, Maine
Quercus rubraRed oakMay 12October 14Alfred, Maine
Tilia americanaBasswoodJuly 12September 1Alfred, Maine
Tsuga canadensisHemlockNAOctober 14Alfred, Maine
Ulmus americanaAmerican elmApril 5May 30Alfred, Maine