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Cass County Extension

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Starting & Planting Seeds

Flower Direct Seed Seed Indoors Plant Outdoors Bloom Period
Ageratum May 10 April 1 May 30 July 1- Frost
Allysum May 10 April 15 May 20 June 15- Oct
Amaranthus May 20 April 15 May 30 July 1- Frost
Aster May 10 April 10 May 25 July 15- Frost
Baby's Breath May 10 April 15 May 30 June 15- July 15
Bachelor Button May 1 April 15 May 15 July 1- Frost
Balsam May 15 April 10 May 30 July 1- Frost
Ornamental Basil May 20 April 15 May 30 Grn,Pur Foliage
Wax Begonia Febr 15 May 30 July 1- Frost
Bells of Ireland May 1 April 1 May 15 July 1- Frost
Browallia May 15 March 15 May 30 July 1- Frost
 Calendula May 10 April 15 May 30 July 1- Frost
Candytuff May 10 April 5 May 20 July 1- Frost
Canna March 20 May 30 July 1- Frost
Carnation May 1 March 20 May 15 July 1- Oct
Clarkia* May 1 March 10 May 15 July 1- Frost
Celosia May 10 April 15 May 30 July 1- Frost
Cleome May 20 April 5 May 30 June 15- Frost
Coleus March 25 May 30 Colored Foliage
Cosmos May 10 April 15 May 30 July 1- Frost
Dahlia May 20 March 25 May 30 July 15- Frost
Dianthus May 1 March 25 May 15 July 1- Oct
Dusty Miller March 1 May 30 Silver Foliage
Fountain Grass   March 1 May 30 July 15- Winter
Four O'Clock May 15 April 15 May 30 July 15- Frost
Gaillardia May 10 April 1 May 20 July 1- Frost
Gazania May 20 March 20 May 30 July 1- Frost
Geranium Febr 15 May 15 June 15- Frost
Globe Amaranth May 10 April 1 May 30 July 1- Frost
Heliotrope March 20 May 30 July 1- Frost
Hollyhock May 1 April 1 May 15 July 1- Sept
Hypoestes April 1 May 30 Colored Foliage
Impatiens March 25 May 30 June 15- Frost
Larkspur* May 5 March 20 May 15 July 1- Frost
Lavatera* May 5 March 20 May 15 July 15- Frost
Lisianthus Febr 1 May 30 July 1- Frost
Lobelia March 15 May 30 June 15- Sept
Marigold (African) May 10 April 10 May 30 July 1- Frost
Marigold (Others) May 10 April 20 May 30 June 15- Frost
Melampodium May 15 April 10 May 30 June 15- Frost
Mimulus May 15 April 1 May 30 July 1- Frost
Morning Glory* May 10 April 20 May 30 July 15- Frost
Moss Roses May 10 April 5 May 30 July 15- Frost
Nasturtium* May 15 April 20 May 30 July 1- Frost
Nemesia* May 20 March 1 May 30 July 1- Frost
Nicotiana April 15 May 25 July 1- Frost
Nierembergia March 20 May 15 July 1- Frost
Nigella May 15 July 1- August 1
Ornamental Cole April 15 May 10 Colored Foliage
Ornmntal Pepper April 1 May 30 July 1- Frost
Pansy March 1 May 10 June 15- Oct
Petunia March 15 May 30 June 1- Oct
Phlox* May 10 March 25 May 20 June 15- Oct
Rudbeckia May 10 March 20 May 20 July 15- Oct
Salpiglossis May 1 March 15 May 15 July 1- Frost
Salvia May 15 April 1 May 30 July 1- Frost
Sanvitalia May 20 April 15 May 30 July 1- Frost
Scabiosa May 10 March 15 May 25 July 1- Frost
Schizanthus May 15 March 25 May 30 July 1- Frost
Snapdragon March 25 May 20 June 15- Oct
Statice May 10 April 1 May 25 July 15- Frost
Stock May 10 March 25 May 20 July 15- Oct
Strawflower May 20 April 10 May 30 July 15- Frost
Sweet Peas* May 1 April 25 May 10 July 1- Frost
Thunbergia* May 15 April 15 May 30 July 1- Frost
Tithonia May 15 April 5 May 30 July 1- Frost
Torenia March 25 May 30 July 1- Frost
Trachymene May 15 April 10 May 30 July 15-Frost
Verbena March 5 May 20 June 15- Frost
Vinca March 1 May 30 July 1- Frost
Zinnia May 10 April 20 May 30 July 1- Frost
Z. augustifolia May 10 April 15 May 30 July 1- Frost
* resent transplanting; start in peat pots.


Todd Weinmann, Extension Horticulturist & Master Gardener Coordinator
Phone: (701) 241-5707
E-mail: todd.weinmann@ndsu.edu

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