How to Germinate Seeds

Tackle seed starting with confidence using these seed germination tips.

Seeds With Hard Seed Coats

Seeds With Hard Seed Coats

Some seeds have naturally hard seed coats that make it tough for water to penetrate so germination can occur.

Photo by: Julie Martens Forney

Julie Martens Forney

Related To:

Seeds bring magic to life in a garden, yielding gorgeous blooms and lip-smacking fruits and vegetables. The transformation from seed to plant starts with germination, when a seed cracks open to sprout a root, followed later by stem and leaves. Many gardeners germinate seeds on paper towels, and then transplant the tiny seedling into soil. Why should you consider germinating seeds before planting?

  • It gives you a chance to check the viability of your seeds.
  • It allows you to sprout many seeds in a very small space—a sandwich baggie.
  • It can speed up the seed sprouting process, with roots appearing in a matter of days in some cases.

To germinate seeds, wet a paper towel or coffee filter. Choose a towel that’s strong when wet. That type holds moisture longer and doesn’t shed lint on seeds (lint can give mold a place to grow). Coffee filters work well because seedling roots don’t penetrate filter paper, which makes it easy to shift germinated seeds to soil.

Place seeds inside the damp towel or filter, and slide it into a sandwich baggie. Don’t seal the baggie tight, because that can provide good conditions for mold to grow. Stash the baggie in a warm spot (65-75°F)—a laundry room, southern window or sunroom. Monitor the towel for moisture and the seeds for signs of mold. Mist the towel if it dries out.

Seeds should germinate in a few days to a week. Once growth is visible, shift the seed to moist soil. Place small seeds on top of soil without covering; bury other seeds to the depth recommended on the seed packet. If the root grows into the towel, at planting time cut the towel around the root and bury it with the root.

Yellow Squash Seeds Germinated

Yellow Squash Seeds Germinated

Germinate seeds on a paper towel to hasten the process. Yellow squash seeds germinate easily on a damp paper towel.

Photo by: Robin J. Carlson for Chicago Botanic Garden

Robin J. Carlson for Chicago Botanic Garden

Hard-to-Germinate Seeds

Some seeds have a hard seed coat that’s nearly impermeable to water, which makes germination difficult. Examples include (above, clockwise from lower left) sweet pea, shell bean, nasturtium and morning glory. With seeds like these, it often helps to soak seeds overnight in water. Many gardeners also add hydrogen peroxide, which helps to soften the hard seed coat and disinfect the solution. Use a mix that’s half water, half peroxide.

On seed packets, it often says to “nick" the seed coat. This improves germination success by physically creating an opening in the seed coat to let water enter. Do this by using the blade of a nail clipper and making a small cut in the seed coat. Place the cut on the side opposite from the hilum, which is a dent on a seed that shows where the seed was attached in the seed pod. Placing the cut away from the hilum ensures you won’t damage the tiny seed leaves tucked inside the seed.

Moonflower Seeds

Moonflower Seeds

Use a file to nick hard seed coats on seeds like moonflower.

Photo by: Julie Martens Forney

Julie Martens Forney

Another way to make an opening in a seed coat is using a file. Rub the seed (hard) against the sharp edge of the file until you create a small opening. Moonflower seeds (shown) also have a hard seed coat and are large enough to hold easily and file. After nicking the seed coat, you’ll still need to soak seeds overnight for a few days, until seeds swell and the seed coat cracks.

Moonflower Seeds Germinating

Moonflower Seeds Germinating

Remove leaves below the first cluster of tomatoes to help reduce disease on tomato plants.

Photo by: Julie Martens Forney

Julie Martens Forney

One way to push germination along with a hard seed coat is to combine nicking with a water-hydrogen peroxide soak—until you see the small root tip appear. A root tip is visible in the seed at the top of the photo. This method speeds germination, which means you can get your garden growing sooner.

Keep Reading

Next Up

Homegrown Hint: Plants in Your Pantry

Discover a whole new source of seeds in your pantry.

7 Things to Remember When Ordering Seeds

Buying seeds? Learn how to make the most of your order.

Seed Swap for Beginners

Like the idea of connecting with local gardeners to exchange seeds? Learn how to set up a seed swap.

Seed Starting 101

Start your seeds in soil blocks to produce robust transplants for your garden without the wasted expense of starter pots.

How to Harvest and Roast Sunflower Seeds

Treat the tastebuds, plan ahead for replanting, and delight backyard wildlife with your homegrown sunflower seeds.

Birdseed Basics

Invite winter birds to your yard by filling feeders with the best birdseed blends.

Tomato Seed-Starting Hack

Simplify planting tomato seeds with this easy method.

Geranium Seeds

Grow these popular garden staples from seed.

Gardening By the Numbers: How to Calculate Cubic Feet and Cubic Yards

What seems like simple math may not be so simple for some, but it's crucial when ordering soil, mulch or compost. Get answers without anyone knowing you asked.

How to Landscape a Shady Yard

See how a landscape designer helps the owners of a large yard solve the problem of too much shade and an unsightly view of the neighbor's utilities.

Get Social With Us

We love to DIY. You love to DIY. Let's get together.

Consult Our A-Z Guide

Everything You Need to Know

Browse a full list of topics found on the site, from accessories to mudrooms to wreaths.  

How-To Advice and Videos

Get video instructions about kitchens, bathrooms, remodeling, flooring, painting and more.

Watch DIY Downloads Now

Watch DIY Network LIVE

Don't miss your favorite shows in real time online.