If the soil is any colder than this, you will see low germination rates – that is, if you can get any seeds at all to germinate! Marigolds should sprout easily from seed if you are planting them at a depth of 1/4" in warm weather and keeping the soil moist. However marigolds in a vegetable garden do repel a wormy pest that is called a nematode that eats roots of vegetables such as tomatoes and other insect pest like aphids. Refer Stage 3: Media EC (Electro Conductivity) EC not more than 0.5: 0.5-0.75: 0.75-1.0: Refer Stage 3 Khorasan Iran. Elegant and eye-catching, they have relatively demure flowers and usually grow from 6 inches to 2 feet tall. If you are fertilizing them, stop. *** The minimum temperature for lettuce seed germination is 32 degrees Fahrenheit (0 degrees Celsius). Why did my marigolds’s leaves change to red color? No fertilizer is required for germination. Give them more water and adjust the amount of sunlight they get. Germination Stages 1 & 2 Germination time: 3–5 days Media temp: 68–72 °F (20–22 °C) Chamber: Optional Light: Not required for germination Seed cover: Yes Moisture level: 5 - SATURATED: Soil is dark brown and shiny, free water is present at the surface of the soil, water drips freely from the bottom of the tray, and trays are heavy When you see the first green tendrils (tiny stems) push up through the soil, you can then remove the wrap. This article has been viewed 231,878 times. Single marigolds are also known as signet marigolds. Sow in media with very low soluble salt levels and pH 6.0-6.5. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/f\/ff\/Grow-Marigolds-Step-1-Version-4.jpg\/v4-460px-Grow-Marigolds-Step-1-Version-4.jpg","bigUrl":"\/images\/thumb\/f\/ff\/Grow-Marigolds-Step-1-Version-4.jpg\/aid857628-v4-728px-Grow-Marigolds-Step-1-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"