Then let soil dry before watering again. % of people told us that this article helped them. You could always prune your plants on a regular basis. With proper care, your flowers will continue to open up and bloom for several days. "We planted sunflowers for the first time this year. We use cookies to make wikiHow great. This article was co-authored by Katie Gohmann. The helianthus genus encompasses almost 70 different species that include many beautiful types of sunflowers. Not terrible, but not the striking wall of red sunflowers I had envisioned. Thin the seedlings by removing the weakest ones if you'd like your flowers to grow as large as possible. Don’t worry if the bottom leaves yellow and drop, but the rest of the leaves are fine. This is necessary for plants that are in windy locations as well. Store seeds in a cloth bag to allow air to circulate. To support them throughout, place a cane next to the stem and tie together for support. The warmer the temperature, the more likely they are to bloom. In this case, 91% of readers who voted found the article helpful, earning it our reader-approved status. Intro: Ten-foot giant sunflowers really can be grown in plant containers (even in small 3-gallon nursery pots). These grow 4 to 6 feet tall and have smaller, more colorful heads. Heirloom sunflowers are great to grow because unlike the Hybrid varieties you can harvest the seeds knowing that they’ll create perfect copies of your parent plants for your future generations. You do not typically need to prune sunflowers. The ox eye sunflower plant is hardy in USDA plant hardiness zones 3-9, allowing most g… If my potted sunflower is dying, is it possible I overwatered it? Long-day: These bloom during the middle of summer. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e4\/Care-for-Sunflowers-Step-1-Version-2.jpg\/v4-460px-Care-for-Sunflowers-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/e\/e4\/Care-for-Sunflowers-Step-1-Version-2.jpg\/aid1318725-v4-728px-Care-for-Sunflowers-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":259,"bigWidth":728,"bigHeight":410,"licensing":"