Keep the fading flowers picked to lengthen flowering period. Unless moved with an unbroken ball of soil, plants do not transplant easily. In February in the house, or as early as you can take care of the plants. Gold, pale yellow, brilliant. Nasturtiums grow well in fairly poor soil.
Rich soils produce too abundant foliage which hides the flowers and cuts down bloom.
Or sow in small pots indoors, transplant later. They are weedy compared with new varieties. Use as backgrounds for lower annuals such as larkspurs and zinnias. Scarlet crimson, lavender, pink, white. Sow in succession to extend blooming period.