Learn how to grow Chrysanthemums from seed. Perennial plants that regularly undergo name changes, and may be listed as Chrysanthemum, Leucanthemum, Pyrethrum, or Tanacetum.
When I Get My Seedling Home
Keep seedlings under very bright light to prevent legginess. Artificial lights are ideal, but a bright (ideally, south-facing) room will work for the short term. You may have to pot on seedlings more than once before they go out to allow for root growth. This is done by transplanting them into a slightly larger container with enough additional soil to keep the container mostly full. Keep the soil moist by daily watering and allow for free drainage so the plants are never sitting water.
Do not transplant outside until daytime temperatures are steadily 10°C (50°F) or warmer. This may mean keeping seedlings indoors for up to a month. The plants should not require any fertilizer until transplant time. Space transplants at 25-45cm (8-18″) apart.
Grow in a rich, well-drained, evenly moist soil in full sun. Good drainage in winter is essential. Pinch back young plants to keep them bushy. Deadhead regularly. Tall plants may require staking.
White flowering mums repel Japanese beetles.
More on Companion Planting.