Fertile soil will produce fewer blooms and more foliage. In USDA zones 9 through 11, the usual sowing time is in winter, but if you want to attempt carrying blooming plants … In warm areas sow from spring to early autumn, but in cold areas sow in spring only. But wait, there's more. Cottage gardeners have a soft spot for nasturtiums. They're also wonderfully ornamental. Cottage gardeners have a soft spot for nasturtiums. By: Mary H. Dyer, Credentialed Garden Writer. In turn the flowers are highly attractive to beneficials such as hoverflies and pollinating bees. If my hunch is correct that more and more people will return to a traditional cottagers lifestyle in coming years, nasturtiums will again be a plant grown almost everywhere, by nearly everyone. of soil feels dry to the touch. And if you need further convincing, the leaves contain a chemical called tromalyt, which acts as a natural antibiotic in the body. Interested in growing nasturtium in pots? Nasturtiums are trailing plants with big and vibrant yellow, orange, red or mahogany blooms. Nasturtium in pots don’t need rich soil, so start them with a potting mix without pre-added fertilizer. Although soaking the seeds isn’t absolutely necessary, it can speed germination time and get the nasturtiums off to a flying start. In areas with mild winters, spring is the best time for planting these charmers. Too much fertilizer can produce lots of foliage but with few blooms. I love the old fashioned climbing types, which unlike the more demure bedding nasturtiums, ramble all over the place and brighten up the garden in a riot of orange flowers. Thin the tiny plants if they appear too crowded in the pot; one healthy plant is plenty in a small pot while a larger pot may accommodate two or three plants. Poke seeds into the soil about 1 inch (3 cm) deep and 3 inches (8 cm) apart. All parts of the plant are edible. Plant nasturtium seeds in early spring in moist, well-drained soil in full sun. When planted in close proximity to sensitive crops, they will repel pests such as cabbage white butterflies, mites and aphids. I have a row of them along one side of the vegie patch that self seed every year and get really excited in March, romping over the adjacent path and scrambling up the picket fence. Sow nasturtium seeds in the spring in USDA zone 8. Fill the container with good-quality potting mix. Nasturtiums form an outstanding living mulch, reducing weeds and maintaining soil moisture. Don’t overfertilise – too much nitrogen will produce lush foliage at the expense of flowers. Plant a few nasturtium seeds in the pot, at a depth of about ½ inch (1.27 cm.). Once the potted nasturtium plants are up and established, water only when the top two inches (5 cm.) Keep in mind that a nasturtium in a container will dry out much faster than a plant grown in the ground. 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