Growing the Prettiest Zinnia Flowers From Seed to Blossom

Looking to add a pop of color to your garden? Learn all about how to grow zinnia flowers from seed to blossom with these simple tips.

In this comprehensive guide, you’ll learn tips for seed starting, prolonging bloom time, and enjoying them as cut flowers. From choosing the perfect varieties to creating beautiful arrangements, this post has everything you need to know.

If you want to add steady color to your garden all season long, look no further than zinnia plants.

They are easy-care, beautiful flowers that bloom all summer long and well into fall.

You can grow shorter varieties.

Tall varieties.

And some in between. The flower heads even range in size, not to mention color, and they are just fun to grow!

I started growing them years ago and they have become a staple in my garden. In fact, I start about 9-10 different varieties each year from seed. And speaking of which, starting zinnias from seed is super easy to do too!

While they look amazing in the garden, zinnias are also wonderful cutting flowers too.

If you aren’t growing them yet, this post will inspire you to try them this year. They are no fail and I know you’ll love them as much as I do!

Here’s what you need to know to grow and enjoy zinnia flowers.

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About Growing Zinnia Plants

Zinnias are beautiful and colorful annual flowers that are easy to grow and care for, making them a favorite among gardeners of all skill levels.

With their colorful flowers in shades of gold, orange, pink, purple, red, variegated, and white, zinnias add a cheerful pop of color to any garden or landscape.

In addition to their stunning beauty, zinnias also make excellent cut flowers, adding an explosion of color and freshness to any indoor space.

Whether you’re an experienced gardener or a beginner, growing the zinnia flower is a rewarding experience that adds a bright pop of color to your home or garden.

How to Grow Zinnias

Native to South America, zinnias have a USDA hardiness zone of 3-10 and depending on the variety can bloom from spring through fall.

They range in height from 8 inches to 4 feet and about 6 inches to 1.5 feet wide.

Here are some zinnia care tips.

Location

The zinnia flower prefers full sun, so choose a spot in your garden that receives at least six to eight hours of sun per day.

They also like well-drained soil that is moist and rich in organic matter. However, they can handle soil that is occasionally dry too.

Zinnias are not very finicky where soil pH is concerned either as they can grow in soil that is acidic, alkaline, and neutral.

When to Plant

As a flowering annual, zinnias can be planted directly in the ground after the last frost date in your area. They prefer warm soil, so wait until the soil has warmed up to at least 60°F before planting.

To test the soil temperature, you can use a thermometer like this.

As an aside, soil thermometers are great to use if you like direct sowing seeds in the garden, so worth including in your arsenal of garden supplies.

Watering

Zinnia flowers need regular watering, especially during hot, dry weather.

In general, water deeply once a week at the base of the plant in the early morning. You’ll need to water more often if there is excessive heat and the soil is dry to the touch.

A soaker hose like this is a great way to water plants from the base. And it’s even more helpful if you use it on a timer like this so watering your zinnia plants is set and forget for the most part.

And if you are growing zinnias in a planter, a drip irrigation system like this makes watering in summer a breeze.

Fertilizing

Zinnia flowers don’t require a lot of fertilizer, but a light application of a balanced fertilizer (such as 10-10-10) at planting time can help encourage healthy growth and blooming.

I feed my zinnia plants in late spring with a slow-release fertilizer so it is set and forget all season long.

Deadheading

To encourage more abundant blooms, deadhead spent zinnia flowers regularly. This will also help prevent the plants from going to seed too quickly.

While deadheading flowers might sound like a chore, it’s a peaceful time and provides the gardener with small moments of relaxation with their flowers.

Deadheading might be my favorite activity to do in the garden. You can use your fingers, a pair of scissors, or garden snips like these.

Pest and Disease

Zinnias are relatively pest- and disease-resistant, but keep an eye out for aphids, spider mites, and powdery mildew or bacterial leaf spot.

Aside from some nibbles by our resident rabbits, I’ve been growing zinnias for years now and have noticed few if any problems with them.

This year, I’m using this deer repellent on my plants as it is supposed to help repel rabbits too. The repellent is systemic so it gets taken in by the plant instead of just being a topical application, but I’m curious to see its effectiveness with rabbits and other wildlife.

At the end of the growing season, zinnias typically start getting powdery mildew on the foliage as they wrap it up.

There’s nothing you can do about it so don’t treat the plants with anything. Just enjoy the rest of the growing season with them and start looking ahead to next year.

To learn more organic ways to care for your flower garden, follow these tips.

Harvesting Zinnia Flowers

Zinnias are a staple in my cut flower garden as they are cut-and-come-again-type flowers. So the more you cut them, the more they will bloom all season long.

Harvest blooms when they are fully open and remove any foliage that will be below the water line in your vase.

See more tips about cutting flowers in this post below.

5 Reasons You Should Grow Zinnias This Year

Zinnia flowers are popular and attractive flowering annuals that are a must-have in any garden. Here are five reasons why you should grow them:

Easy to Grow

Zinnias are the easiest flowers to care for, making them a great choice for gardeners of all levels.

They are tolerant of a wide range of soil and climate conditions and can be planted directly in the ground or in containers.

But they are not just easy to grow as plants, they are also super easy to start from seed too. If you are interested in dabbling with seed starting, I highly recommend beginning with something easy like zinnias, sunflowers, nasturtiums, or calendula.

Gorgeous Zinnia Flowers

To grow a zinnia is to love them because you just can’t beat those beautiful and vibrant flowers!

Zinnias come in a wide range of colors, from bright pinks and oranges to soft pastels and whites. They have a unique, daisy-like shape that is eye-catching and attractive, making them a popular choice for garden beds, borders, and containers.

Zinnias not only look good in the garden, but they also make great cut flowers for arrangements that can be used in your home.

Long-Lasting Blooms

Zinnias produce a profusion of blooms throughout the growing season. The blooms begin in early to midsummer and last well into fall.

And with regular deadheading, the blooms can last for weeks. This makes them a great choice for cut flower arrangements, as well as for adding color and interest to your garden.

You’ll know when the plant is done for the season when it starts to get a powdery mildew on the foliage. This happens in my gardening zone 6a zinnias in about mid-September.

They’ll still produce flowers though, so I keep cutting them until they are truly done for the year.

Attracts Pollinators

Zinnias are a great source of nectar for bees, butterflies, and other pollinators. I’ve noticed loads of butterflies dropping by my zinnia flowers often.

And last year while setting my outdoor dining table for a garden party, one landed right on my centerpiece with fresh-cut zinnias from the garden.

It was so fun to see that!

The Best Cutting Flowers for Bouquets

What I love most about zinnias, is that they look amazing both in the garden and a bouquet.

Zinnias are one of my favorite flowers to grow and cut for arrangements. Here’s why.

• They come in a variety of sizes and colors
• Have a long vase life
• Easy to grow
• They produce so many blooms all season long
• Pollinators enjoy them
• Simple to cut and arrange

And they look so pretty with other flowers like celosia, hydrangeas, dahlias, sedum autumn joy, snapdragons, and many more.

How to Start Zinnia Flowers from Seed

Seeding zinnias is a cost-effective and rewarding way to grow these beautiful flowers, as well as get a head start on the season.

You’ll have greater access to the many varieties of zinnias available, so they are worth growing from seed if you are up to it.

Planting zinnia seeds is super simple to do. And the best part? You can start them both inside or out. If you choose to start them outdoors, wait until after your last frost date.

If you are not sure when to plant zinnia seeds, you’ll need to know your last frost date and count about 4-6 weeks before.

Supplies Needed

• Seeds
• Vermiculite
• Seed Starting Potting Soil
• Seed Trays
• Bottom or Drainage Trays
• Clear Dome Lids
• Grow Lights
• Table or Shelf System for Seedlings
• Heat Mat
• Plant Labels
• Oscillating Fan
• Programmable Timer

Directions for Seeding Zinnias Indoors

• Zinnias can be started indoors about 4-6 weeks before the last expected frost in your locality. Use a seed starting tray or small pots with drainage holes filled with a quality organic seed starter mix that is pre-moistened. I start mine under grow lights and have found great success starting them in both my basement and sunroom.
• Make a small hole then sow the seeds then lightly cover them with vermiculite. Sow only one variety per cell tray as the different plants will germinate at different times.
• Cover seed trays with a clear dome and move them under the grow lights on a heat mat to speed up germination. They typically germinate within a few days to a week.
• Remove the cover when the seeds start to germinate. It’s OK if they didn’t all germinate, more will grow after the cover is removed.
• Keep soil moist by bottom watering only.
• Before transplanting zinnia seedlings outdoors, harden them off by gradually exposing them to outdoor conditions over a period of 14 days.
• When seedlings are hardened off and ready to plant in the garden, space zinnia transplants about 9 inches apart after the last frost date.
• Water young plants regularly, keeping the soil moist but not waterlogged. Feed with an organic fish fertilizer for a few weeks and then use a slow-release fertilizer so feeding them is set-and-forget. This will help promote healthy growth and lots of blooms.

How to Enjoy Zinnias From Your Cut Flower Garden

Zinnias are beautiful and long-lasting cut flowers that can brighten up any room. To help prolong the flowers in a vase, here are some tips to follow.

• Always start with a clean vase or floral foam.
• Prepare each flower for the arrangement. If you are cutting your own flowers, start with the freshest flowers you can find. Look for flowers that are just starting to open, with sturdy stems and bright, vibrant colors.
• Cut the stems at a 45-degree angle using sharp garden snips or scissors. Cut the stems early in the morning when the plants are still cool and hydrated.
• Remove any leaves or thorns from the lower part of the stems that will be submerged in water. This will help prevent bacteria growth and keep the water clean.
• Immediately after cutting, place the stems in a vase filled with clean, lukewarm water. And allow them to sit for a few hours so they acclimate to life in a vase.
• Re-cut stems on an angle and arrange flowers in a second vase with room temperature water.
• Add flower food to the water to help extend the life of the flowers. Alternatively, you can make your own flower food by mixing a quart of water with 2 crushed aspirins, a teaspoon of sugar, and a teaspoon of bleach.
• Keep flowers in a cool shady spot that is away from direct sunlight and drafts.

Do Zinnias Come Back Every Year?

Those new to growing them sometimes wonder whether to consider zinnias annual or perennial.

But, zinnias are typically grown as annuals, meaning that they complete their life cycle in one growing season and do not come back the following year.

However, there are some zinnia varieties that can reseed themselves and return the following year. These varieties include ‘Cut and Come Again’, ‘State Fair’, and ‘Persian Carpet’.

If you want your zinnias to come back year after year, you can collect the seeds in the fall after the flowers fade and store them in a cool, dry place until the following spring.

Then, sow the seeds indoors or direct sow them in the garden once the weather has warmed up and the danger of frost has passed.

What Month Do You Plant Zinnias?

When to plant zinnias depends on your climate and hardiness zone.

In general, zinnias are warm-season annuals that are planted after the danger of frost has passed and the soil has warmed up. In most regions, this means planting zinnias in the spring or early summer.

If you live in a cooler climate, you can start seeding zinnias indoors in early spring and transplant them outdoors once the weather warms up.

I garden in zone 6a, so I like to start my zinnia seed indoors so I can transplant them after all danger of frost has passed which is usually mid-May. If I decide to plant them a little earlier, I watch the weather like a hawk in case we get a frost.

To determine the best time to plant zinnias in your specific region, consult with your local cooperative extension service or other local gardeners for advice.

How Do You Keep Zinnias Blooming?

Zinnias are relatively easy to care for, but there are a few things you can do to keep them looking amazing and continually blooming throughout the growing season.

• Deadhead regularly.
• Keep them hydrated.
• Fertilize them.
• Grow them in full sun.
• Watch for pest or disease problems.

My Favorite Flowers to Grow

Here are some of my favorite zinnia varieties to grow. I’ve got a few growing in the potager garden this season.

• ‘Benary’s Giant Wine’
• ‘Queen Lime Orange’
• ‘Queen Lime with Blush’
• ‘Senora’
• ‘Oklahoma Salmon’
• ‘Benary’s Giant Carmen Rose’
• ‘Uproar Rose’
• ‘Zinderella’
• ‘Profusion’

More About Growing Zinnias

Do you grow zinnias in your garden? What are your favorite varieties? I would love to know more in the comments below.

And don’t miss joining my Gardening DIY and Decorating Community on Facebook for more chatter. And follow along there and on Instagram as well. There are behind-the-scenes daily things that I share on Instagram that don’t make it to the blog. Would love to see you there too!

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Garden Supplies I Use

I’m often asked about the garden supplies and tools that I use most. From pruners to deer repellents, here are some of my favorites listed in no particular order.

• I like to use a good-quality garden soil, compost, and perlite when planting.
• I have used this deer repellent with great success. But now, I’m all about this deer repellent that is systemic instead of topical. This means the plant takes it in as opposed to it just smelling bad.
• Hands down this is my favorite hand-weeding tool. You can use to get underneath roots, loosen soil, and it cuts down on the weeding time because you work much faster.
• But I also love this long, stand-up weeding tool to really get around roses from afar.
• I like to use THIS ORGANIC FERTILIZER for roses because the blooms are more prolific and it’s organic.
• You’ll need a sharp set of pruners when working with plants and flowers. I buy a few so I can stash them around.
• Where pest and disease problems are concerned, I generally use this insecticidal soap or neem oil to help control infestations depending on the issue.
• This is my favorite set-and-forget slow-release fertilizer for houseplants, annuals, and container gardens.

Looking for More Flower Garden Ideas?

If you love flowers and want to grow more in your garden, here are some posts that will get you on your way.

From tucking in flowering plants that are deer-resistant or ones that attract more butterflies and hummingbirds, to shade-loving flowers like the lenten rose, these posts will get you on your way to growing a garden that will bring joy for years to come.

Here are more cut flower and cottage garden growing tips, tricks, and design inspiration.

• 5 Quick Ways to Grow a Cottage Garden
• Easy-Care Cottage Garden Ideas
• Flower Garden Ideas for the Front Porch
• Why and How to Divide Perennials
• Perennials vs Annuals
• Flowers that Bloom in Midsummer
• How My Cottage Garden Grew in 2021
• Cut Flower Gardening for Beginners
• The Complete Guide to Roses Care
• The Basics of Hydrangea Care
• Everblooming Cottage Garden Design Ideas
• The Secret to Growing an Everblooming Cottage Garden

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Enjoy a beautiful day! xo

About Me

Want to learn more about me?

I’m a master gardener who’s been gardening and growing things for over 25 years. With a deep passion for gardening, I enjoy helping others find their inner green thumb with all things plants and flowers, as well as find ways to bring the outdoors inside their homes too.

Get the inside scoop about my background as a master gardener, education, and experience, as well as why I started blogging.

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