Organic Double Standard Sweet Corn Seeds

Organic Double Standard Sweet Corn Seeds

San Diego Seed Company

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Product Details

Double Standard is a super sweet open-pollinated corn that is delicious eaten fresh off the cob! Early maturing corn with white and yellow kernels. Ears average 7″ (17.8cm)long on vigorous 5′ (1.5m) plants. Planting in blocks allows for good pollination that is essential for corn kernel development. In Southern California, you can succession plant at least two rounds of corn to enjoy all summer long!

Product Details

Approx Seed Count


Seed Weight

10G, .4oz

Botanical Name

Zea mays

Planting Season 


Soil Temp

65° F+, 18°C+

Planting Depth

½”, 1.2cm

Area to Sow

5'x5' area, 1.5x1.5m area

Days to Germ.


Days to Maturity


Best Planting Method

Direct or transplant

Thin to

Final spacing

Final Spacing

≥6" apart, 15.2cm


21 days

Plant Spread

12-24", 30.5-61cm

Plant Height

72", 1.8m


Planting by Zones

Zones 9-10

  • Corn is a warm season crop that should be grown when soils have reached a minimum temperature of 65°F (18°C).  This occurs in mid-May in Zones 9 and 10. It will not germinate well in cold soils.

Planting Corn Seeds

  • Corn seed is very easy to direct sow. For Zones 9 and 10, sow seeds in deeply irrigated soils to guarantee even and quick germination. Plant seeds every 3″ (7.6cm), thinning later to 6″ (15.2cm) apart.
  • Fertilize regularly with an organic liquid fertilizer once the seedlings have germinated and are about 4″ (10.1cm) tall.
  • If transplanting out, plant it in the garden when it is 6-7″ (15.2-17.8cm) tall. Space at least 6″ (15.2cm) apart. Plant in full sun.

Growing Corn

  • For healthy kernel development, you must ensure good pollination. Pollination happens when pollen from the tassels falls onto the silks. To ensure this, corn must be planted in blocks, and you must plant at least 10 plants to get a good yield. Plants can be grown very close together if you are planting in a small space.
  • Corn requires adequate moisture and moderately fertile soil to produce a healthy crop. Side dress with a granular organic fertilizer if you believe your soil has low fertility.
  • More information about growing corn in our in-depth article!

Succession Planting Corn

  • Plant every 10-days for a continuous crop to harvest.

Growing Corn in Containers

  • Do not grow in a container unless you can fit a bare minimum of ten plants in the size of the container being used. It's better if you can plant at least a 3'x3' (1x1m) container, such as our 100-gallon Root Pouch.

Harvesting Corn

  • Corn is harvested differently depending on the type you grow.
    • Sweet Corn is harvested when the peak sugar has condensed in each kernel—ears will feel firm and full. Other signs of maturity are dry silks and ears that are tilted from the stem. You can peel back the silk and squeeze a kernel. If the liquid that comes out is milky, it’s ready! Keep in mind the quality of sweet corn declines if you let it stay on the stalk too long. Sugar contents turn to starch, making the corn less appealing to eat fresh. If this happens to you, simply use the corn in cooking applications like corn chowder, corn cakes, or other recipes.
    • Popcorn/Mill Corn and Dent Corn are left to mature on the cob. As they mature, the silks will dry out. These types can be stored dry until needed. Popcorn can be popped by placing the whole cob (husked) in the microwave in a brown paper bag.
    • More information about when to harvest corn on the site.

Southern California Pro Tips

  • In areas of Zones 9 and 10, corn can be succession planted several times for a harvest that can be enjoyed all year long!
  • Aphids and ants are the most common corn issues in Southern California.

Companion Flowers/Crops

  • Corn is a tall plant that is planted in blocks. For this reason, smaller bushy plants planted on the perimeter of your corn patch will bring beneficial insects and make your corn patch even more beautiful. Plant zinniassunflowers, and amaranth around your corn.

Additional Learning Resources

  • New to starting crops from seeds? Please read our article, Starting Seeds Indoors, to learn the basics!
  • Corn smut is a disease that causes fungus to grow on ears… but it’s delicious fungus. Learn more here.
  • Did you know corn microgreens were a thing? They are!
  • Other than sweet corn, there are many types of corn out there.
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