Order -Granny's Favorites - Top 10 Annual Flowers that are Easy to Grow from Seed
Growing any of these flowers is truly as simple as putting the seed in the ground and keeping them watered.

Centaurea cynaus (aka Bachelor's Buttons) 12-36 inches tall in shades of pink, blue, lavender and white. One of my favorite sights is to arrive in the gardens early in the morning and see the finches as they ride the waves of the air feasting on the bachelor button seeds.  Bachelor buttons are great for small nosegay kind of bouquets.  They work well in larger ones too but after the first blush of bloom you are going to have flower heads going to seed among the fresh blooms.  The buds are good for pressing but not the flower heads.  The petals are edible.
Calendula officinalis (pot marigold): You get a lot for your money with calendula!  Start them early in the season (mid April) because they like it cool.  They will bloom in late spring and early summer and limp along in July and August, but come the cooler weather of September and October and they will bloom enthusiastically until a hard freeze.  You can count on calendula to reseed itself year after year and to be the last thing blooming in your garden.  The petals are edible.
Cleome (aka Spider Flower): The first time I saw cleome blooming it was in the middle of a neighbor's field.  The next spring, I saw a seedling in my garden that looked sort of like a tomato but not quite.  My rule with plants I cannot identify is to wait and see what they become.  This one turned out to be the same kind that was growing in my neighbor's field the year before. The flower is amazing.  It looks great in a bouquet of just cleome's but only last a day or two.  It is not good for pressing, drying or eating and does not have a nice fragrance but I would not consider my garden complete without it.  It is a dependable self seeder but does not germinate until the soil is nice and warm in early June.  Cut it back after it's first blooming and it will bloom again.
Cosmos: I first discovered cosmos when someone donated a quart ZipLoc bag of cosmos, Bright Lights at our first perennial exchange.  We planted them everywhere!  They turned out to be the perfect flower for teaching the seed cycle.  Planted in the spring, by the time school started in the fall they are in full bloom so there were plenty of flowers to pick.  The best part is that students are able to observe the whole flower to seed process on one plant.  On the same plant there will be a tight bud, one about to open, one half open, one in full flower, another where the flower is fading, one where the seeds are formed and one where they are brown and about to drop.  They come in a variety of colors and "faces" and the "Sensations" press beautifully.
Hyacinth Bean vine: My friend, Rita Heikenfeld, introduced me to Hyacinth Beans.  Like all beans, it is super easy to grow, just put them about 1" into the soil, water, and in less than a week you will see sprouts. Before you know it you will have a tall vine covered with sweet pea like, purple and white flowers.  The show is just beginning.  The flowers are followed by bright purple seed pods which are almost just as showy.  Even the seeds are beautiful.  It is not suggested that you eat this bean. (6' to 20' vine.)
French Marigold are a great addition to the gardens and they are dependable self-seeders.  We planted bunches of seeds in the gardens the first year and have not had to plant them since.  We just pull them out where we do not want them.  They look great in the fall garden, provide us with lots of flowers for the students to pick and are perfect for the seed collecting lessons because the seeds are so easy to identify.
Sun Flower: Whatever else may be blooming around them, sunflowers always take center stage.  What most people visualize when you mention sunflowers are the 10 foot giants with the 18" flowers.  It's true that these are real show stoppers and I love having them in the garden but with these you only get one flower per plant. Of the 20 or more varieties we usually grow, my personal favorite is the fuzzy faced Teddy bears... or, maybe the ones with the deep burgundy flowers. Have you seen the ones that have all of the colors of the sunset?  Now you know why we grow so many varieties. Petals and seeds are edible.
Straw Flower: This flower is so perfect for drying that it feels dry while still on the plant.  They are perfect for making dried arrangements and wreaths. Having no time for crafts, I picked a few three years ago, tied them into little bouquets and hung them upside down over my kitchen door to dry. They looked so nice hanging there that I never took them down. The flower colors are still as vibrant as ever.  
Sweet Peas:  3-4 years ago, I planted perennial sweet peas by the bridges in the perennial gardens. I envisioned them growing up the railings of the bridges and peeking between the post.  They do this early in the season and look awesome.  But then they keep growing and the bridges are not large enough to contain all of their mass so they grow over everything within 3-4 feet of the bridges.  They are so beautiful when in bloom, though, that I have not been able to bring myself to dig them up.  I just keep cutting them back.  This year, I am planting 7-8 new annual varieties that are more fragrant.  These will go in back of the school in the hill gardens so they can hang down the retaining wall and take up all the space they want.   I am planting fragrant annual varieties.
Zinnia:  If I had to pick one flower for cutting, it would be zinnia.  They come in many colors, a wide range of sizes (6 inches to 6 feet) and have many "faces".  They produce lots of flowers over a long period, are long-lived in the vase and are super easy to grow.  If they smelled as good as roses, they would be the perfect flower.
 
"Don't judge each day by the harvest you reap, but by the seeds you plant."  Robert Louis Stevenson

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