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Sun and Soil Requirements for Growing Sunflower Plants

Gardening Guide: Super Sunflowers Guide

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Sun and Soil Requirements for Growing Sunflower Plants

By Bill Dugan, Executive Editor

Young sunflower sprout growing in the sun

Young sunflower sprout growing in the sun

Sunflowers are among the most easygoing of all annual plants; plant your seeds in a sunny spot and watch your flowers grow. It really is just about that easy.

Sunflowers love full sun—at least six to eight hours of bright sunshine every day. The more sunshine they get, the happier they’ll be.

When you’re planning your sunflower planting, pH is not crucial, although ideally they prefer soil with a pH of 6.0 to 6.8. If you don’t know the pH of your soil, you should have it tested. A local extension center will analyze your soil and give you a thorough, detailed report on not only the pH, but the level of nutrients in your soil and recommendations for amending the soil if needed. Getting your soil tested means you’ll only need to spend time, energy, and money on soil amendments when they’re actually necessary. A soil test will also identify any elevated levels of lead or other toxic heavy metals in your soil. These tests, available at your regional extension center, are not expensive—and they can save you money and aggravation!

When you choose a sunny site for your sunflowers, make sure the spot has well-draining soil. Check the spot just after a rain: does the water pool up? Not a good sign. Either build up the soil to allow for better drainage or find a new site.

The ideal soil should be loose, loamy, and well-draining. Sunflowers are heavy feeders and they send out taproots way down into the ground (up to 6 feet or more!). So prepare your planting area by digging down at least 2 feet and 3 feet across. The soil needs to be nutrient-rich: use organic matter or composted manure. You can also work in a slow-release granular fertilizer about 8 inches down. That will give your plants their best possible start!

Sunflowers need nitrogen at the beginning of their growth cycle so they can get their leaf production going. Once the flowers bud, nitrogen is not essential. If you do add nutrients once the flowers emerge, blood meal and fish emulsion are good choices.

Have you successfully chosen a spot for sunflower plants? Please tell us your tips for getting sunflower plants to grow in your selected site.

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blood meal, fertilizer, fish emulsion, granular fertilizer, soil amendments

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Sunflowers

TABLE OF CONTENTS

  • Curator’s Corner
  • Introduction
  • Types of Sunflowers
  • Growing Sunflowers From Seeds or Seedlings
  • Sun and Soil Requirements for Growing Sunflower Plants
  • Planting Sunflower Plants in the Ground or in Raised Beds
  • Companion Plants for Sunflowers
  • Growing Sunflower Plants in Containers
  • Watering, Weeding, Fertilizing, and Pruning Your Sunflower Plants
  • Harvesting Your Sunflowers
  • Storing and Preserving Your Sunflowers
  • Dealing with Sunflower Diseases
  • Dealing With Sunflower Pests
  • Essential Tools and Equipment for Growing and Enjoying Sunflowers
  • The 9 Best Sunflowers to Grow This Season
  • Plant Profiles

  • Mammoth Grey Stripe Sunflower
  • Chocolate Sunflower
  • Ring of Fire Sunflower
  • Mongolian Giant Sunflower
  • Black Russian Sunflower
  • Super Snack Mix Sunflower
  • Sunspot Sunflower
  • Recipes

  • Sunflower Seed Crusted Chicken
  • Sunflower Flour
  • Sunflower Bread
  • Toasted Sunflower Oil
  • Honey Sunflower Bites
  • Additional Articles

  • Nutrition Facts about Sunflowers
  • Home Remedies and Health Benefits of Sunflowers
  • Resources about Sunflowers
  • Sunflowers Glossary

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