Average Bloom Times

These are the average bloom times for a typical year, 1998. Please be aware that blooming dates are very variable from year to year due to weather conditions.

Crocus tommasinianus Tommies 9 February 9 March
Scilla siberica Siberian Squill 13 February 7 April
Scilla tubergeniana 11 February 7 April
Eranthis hyemalis Winter Aconites 1 February 28 February
Galanthus nivalis Snowdrops 1 February 9 March
Leucojum vernum Spring Snowflake 20 February 5 March
Narcissus sp. Daffodils 18 February 20 April
Chionodoxa luciliae Glory of the Snow 27 February 1 April
Crocus sp. Crocus 25 February 30 March
Galanthus nivalis ‘Flore Pleno’ Double Snowdrops 27 February 5 March
Iris reticulata Dwarf Iris 27 February 17 March
Muscari sp. Grape Hyacinth 5 March 15 April
Anemone blanda 5 March 15 April
Ipheion uniflorum Spring Starflower 13 March 15 April
Tulipa sp. 1 April 21 April
Ornithogalum umbellatum Star of Bethlehem 14 April 26 April
Fritillaria meleagris guinea hen 7 April 20 April
Scilla campanulata bluebells 13 April 7 May
Iris germanica bearded Iris 1 May 8 May
Iris siberica Siberian Iris 7 May 18 May
Hemerocallis fulva Tawny Daylily 8 June 29 June
Hemerocallis flava Lemon Lily 29 June 31 July
Lilium sp. Asiatic Lily 1 June 15 July
Lycoris squamigera Resurrection Lily 27 July 15 August
Crocus speciosus Fall Crocus 15 September 22 September
Calendula officinalis Pot Marigold all winter all winter
Bellis perennis English Daisies 1 February 1 July
Helleborus orientalis Lenten Rose January April
Iberis sempervirens Candytuft 10 March 1 June
Mertensia virginica Virginia bluebells 24 March 1 May
Brunnera macrophylla Siberian bugloss 24 March 15 June
Epimedium sp. Epimedium 24 March 1 June
Cheiranthus cheirii wallflowers 24 March 1 June
Arabis causcasia rock cress 24 March 1 June
Claytonia virginica spring-beauty 24 March 15 April
Viola tricolor Johnny-Jump-Up 24 March 1 June
Viola x wittrockiana pansy 24 March 1 June
Digitalis purpureum foxglove 27 April 1 June
Digitalis lanata Grecian foxglove 21 May 31 May
Aquilegia sp. columbine 21 April 1 June
Dodecatheon meadia Shooting star 25 April 15 May
Chrysongonum  virginianum green and gold 1 May 15 May
Convallaria majalis Lily of the Valley 20 April 9 May
Polygonatum biflorum Solomon’s Seal 1 May 15 May
Primula sp. primroses 13 April 1 June
Paeonia sp. peony 21 April 30 June
Papaver nudicaule ‘Wonderland’ Icelandic poppy 25 April 1 June
Lilium hybrids Asiatic lilies 1 June 15 July
Malva sylvestris Moon and Stars 1 June 21 June
Alcea Hollyhocks 1 June 15 July
Astilbe x arendsii False Spirea 1 June 1 July
Antirrhinum Snapdragons 1 May 15 May
Achillea Yarrow 15 June all summer
Baptisia australis False Indigo 1 June 1 July
Chrysanthemum leucanthemum Shasta Daisy 1 June 1 July
Dianthus caesius Pinks 15 May 15 June
Echinacea purpurea purple coneflower 15 June all summer
Nigella damascena love-in-a-mist 21 June 15 July
Liatris spicata Liatris 21 June August
Monarda didyma Beebalm 29 June all summer
Rudbeckia fulgida Black Eyed Susan 21 June all summer
(Stokesia laevis) Stoke’s Aster 21 June August
Ageratum Ageratum 21June all summer
Lantana Lantana 15 June all summer
Salvia spp. Salvia 21 August frost
Rudbeckia hirta Gloriosa Daisy 21June all summer
Clematis heracleifolia Tube Clematis 15 June 1 September
Cosmos cosmos 20 July all summer
Lobelia cardinalis Cardinal Flower 30 July 15 September
Lobelia siphilitica Blue Cardinal Fower 30 July 15 September
Canna sp. Indian Shot 20 July frost
Zinnia 1 July frost
Aster divaricatus White wood aster 21 August 21 September
Aster novae-angliae New England Aster 15 August 15 September
Anemone hupehensis var. japonica Japanese anemones 21 August 15 September
Verbena bonariensis 15 August all summer
Dahlia 1 August all summer
Limonium Statice 15 August all summer
Aster novi-belgii Michelmas Daisy 21 September frost
Aster tataricus Tatarian Asters 21 September frost
Lespedeza thunbergii 1 September 21 September
Dendranthema grandiflora. chrysanthemum 1 September frost
Chaenomeles sp. Flowering Quince 18 February 10 March
Jasminum nudiflorum Winter Jasmine 9 January 1 March
Daphne odora ‘Aureo-marginata’ Fragrant  Daphne 20 February 15 April
Lonicera fragrantissima Winter Honeysuckle 16 February 1 April
Mahonia aquifolium Oregon Grapeholly 20 February 15 April
Pieris japonica Japanese Pieris 20 February 1 July
Hamamelis spp. witch hazel 1 February 1 March
Forsythia suspensa var. sieboldii Weeping Forsythia 23 February 10 March
Forsythia sp. Forsythia 10 March peak 29 March
Kerria japonica Japanese rose 24 March 15 April
Viburnum x burkwoodii 20 March 15 April
Viburnum carlesii 20 March 15 April
Poncirus trifoliata Trifoliate Orange 1 April 15 April
Syringa Lilac 3 April 1 May
Rhododendron spp. 3 June 15 June
Azalea ‘Indica Alba’ 16 April 1 May
Azalea ‘Poukhanense Pink’ 20 April 30 April
Deutzia gracilis 14 April 1 June
Viburnum trilobum American Cranberrybush 20 April 1 June
Viburnum plicatum var. tomentosum Doublefile Viburnum 23 April 1 June
Leucothoe fontanesiana Drooping Leucothoe 23 April 1 June
Rosa sp. roses 24 April all summer
Calycanthus floridus sweetshrub 5 April 1 June
Pyracantha coccinea Firethorn 21 April 1 June
Philadelphus coronarius Mockorange 29 April 1 June
Weigela florida Weigela 28 April 1 June
Kolkwitzia amabilis Beautybush 27 April 1 June
Chionanthus virginicus Grancy Gray Beard 27 April 1 June
Deutzia scabra ‘Plena’ 4 May 1 June
Philadelphus coronarius Mock Orange 3 May 1 June
Deutzia crenata or scabra 3 May 1 June
Cotinus coggygria Smokebush 7 May 1 June
Nerium oleander oleander 15 July frost
Abelia grandiflora Glossy Abelia 15 July all summer
Buddleia davidii Butterfly bush 1 July all summer
Acer rubrum Red Maple 15 January 1 March
Prunus subhirtella var. autumnalis Autumnalis Cherry all winter 7 April
Prunus subhirtella var. pendula Weeping Cherry 5 March 1 April
Cornus mas Cornelian Cherry 20 February 1 April
Prunus x blireiana Blireiana Plum 15 March 1 April
Magnolia kobus Kobus Magnolia 15 March 5 April
Magnolia stellata Star Magnolia 17 March 5 April
Magnolia denudata Yulan Magnolia 17 March 5 April
Magnolia denudata ‘Purple Eye’ Yulan Magnolia 17 March 5 April
Magnolia ‘Galaxy’ Lily Magnolia 31 March 30 April
Pyrus x lecontei ‘Keiffer’ Keiffer pear 20 March 1 April
Pyrus pyrifolia Chinese Sand Pear 30 March 1 April
Prunus x yedoensis Yoshino 28 March 1 April
Prunus cerasus Sour Cherry 28 March 1 April
Pseudocydonia sinensis Quince 31 March 1 April
Malus sp. Crabapples 1 April 15 April
Halesia carolina Carolina Silverbell 15 April 30


Cornus florida Dogwood 6 April 1 June
Paulownia tomentosa Empress Tree 20 April 1 June
Styrax japonica Japanese Snowbell 15 April 30 April
Styrax obassia Fragrant Snowbell 27 April 1 June
Liriodendron tulipifera Tulip tree 27 April 1 June
Syringa pekinensis Pekin Lilac 7 May 1 June
Cornus kousa Chinese Dogwood 14 May 1 July
Magnolia grandiflora Southern Magnolia 21 May 15 June
Lagerstroemia indica Crape Myrtle 20 July 5 August
Elaeagnus pungens Elaeagnus 1 October 15 October
Akebia quinata Five Leaf Akebia 20 February 1 June
Wistaria sinensis Chinese Wisteria 13 April 1 May
Wistaria japonica Japanese wisteria 19 April 1 May
Clematis x Nelly Moser 27 April 3 June
Dolichos lablab hyacinth vine 15 September frost

10 comments on “Average Bloom Times”

  1. When do you predict that the chrysanthemums in the Herbaceous Border will be at their height? Thank you.

    • It is usually mid-October and this is what we expect this year too. The early mums are going to be transplanted into the borders starting next week, with the later ones coming in the week after. We’ll be sure to keep everyone posted with pictures.

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  9. Last March we visited Dumbarton Oaks and took a picture of a shrub or small tree near the wall of the Rose Garden. It had coiled seed pods, which is the plant we are trying to identify. Can you help identify this shrub? The pods have a raisin like seed. Thank you!

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