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Mirabilis jalapa 'Alba' Four O'Clock
Reseeding Annuals

Self-Sowing Annuals
by Diane Linsley

Many years ago, I went on a tour of a place that the locals affectionately (or jealously) refer to as "the castle". I was shocked by the profuse display of perennials -- thousands of dollars worth! Planted en masse! It was nothing like my own garden, where I had one of each plant, spaced far apart.

At that point, I realized just how many plants it takes to make a great garden. I also realized, unhappily, that my own garden would never look like that. I simply couldn't afford it! In spite of my crushed hopes, I continued to collect perennials whenever I had a few dollars. Then something happened that forever changed the way I gardened. I discovered self-sowing annuals. (Scroll down or click here for a list of self-sowing annuals.)

Don't ask me why I never tried them before. Maybe it's because I wanted to follow the advice in all those gardening books that extoll the virtues of perennials. Now, don't get me wrong. I love perennials! I can't imagine a garden without them. But when you want to cover lots of ground in a short amount of time on a skinny budget, there's nothing like self-sowing annuals.

Like perennials, self-sowing annuals come back every year, but from seeds instead of roots. But they're not as predictable as perennials. They come up wherever they choose, sometimes in a distant part of the yard. Sometimes they come back in excess, and sometimes not at all. If a perennial is like a faithful dog, then a self-sowng annual is like a finicky, independent cat. Maybe that's why I like them -- I'm a cat person. I like how my cat doesn't require too much attention, and I repect her independence.

But, as with all things in life, there are problems with independent cats -- I mean plants. It seems like they fall into one of two categories: (1) those that don't return reliably, especially in heavily mulched gardens, and (2) those that return in such force that they become a thinning nightmare. The unpredictability can drive a control freak insane!

How do you solve this dilemma? How about giving up the illusion of control? That's a challenge for this gardener who uses a yard stick to space her plants properly. But it helps if I refer to my garden as "the cottage garden" instead of "the perennial border". 

Now that the disadvantages of self-sowing annuals are out of the way, we can talk about the benefits. Here are four reasons to grow self-sowing annuals:

1. They're cheap.
2. They fill in the gaps between perennials and make your garden look lush.
3. If you don't like them, you can pull them up before they go to seed.
4. Did I mention that they're cheap?

One of the most common questions that people ask me about self-sowing annuals is, "Why can't I just sow the seeds in the fall and have lots of flowers the following summer?"

Here's my reply: You can do that with some annuals, but it doesn't work with everything. The more finicky ones need warm temperatures to germinate. They are best sown indoors the first year, or sown outdoors after the last frost date in spring. The reason why they still manage to reseed in the garden is because they make millions of seeds. Some of the seeds are bound to survive the winter and bloom the following year. But you're not getting millions of seeds in a packet, so please don't waste them by sowing at the wrong time. Follow the directions on the packet. The following annuals work in my zone 5 garden. I don't know how they will perform in your garden. You never know until you try.

Self-Sowing Annuals

Alyssum 'Carpet of Snow'
Blue Woodruff
Bupleurum 'Green Gold'
Calendula officinalis
Centaurea cyanus
Cynoglossum amabile
Clarkia amoena
Cleome hassleriana
Cosmos sulphureus
Eschscholzia californica
Impatiens balsamina
Lavatera trimestris
Mirabilis jalapa
Morning Glory
Orlaya grandiflora
Rudbeckia hirta
Scabiosa atropurpurea
Silene armeria
Sweet Pea
Verbena bonariensis
Viola tricolor

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