Tag Archives: propagation

Crocosmia: Flower or Weed?

24 Sep

I came across this poem recently, by Ian Emberson:

A weed is a flower in the wrong place,
a flower is a weed in the right place,
if you were a weed in the right place
you would be a flower;
but seeing as you’re a weed in the wrong place
you’re only a weed –
it’s high time someone pulled you out.

I suspect some difficult interpersonal dynamics led to the last few lines, so I won’t dwell on those. But I quite like the first two lines. They summarize my feelings about a beautiful flower in my garden, which I love when it’s in the right place and frown over when it pops up (again and again) in the wrong place(s): Crocosmia.

Crocosmia is a member of the Iris (Iridaceae) family, along with its gladiolus and crocus cousins. Plants in this family are perennial, and grow from bulbs, corms, or rhizomes. They have tall, upright foliage; Crocosmia leaves have been called “sword-like” and are easily spotted and admired in the garden.

The tubular, scarlet-red flowers are spectacular as well, and are wildly attractive to hummingbirds, who have been known to defend their Crocosmia patch against any and all interlopers. For hummingbirds, a Crocosmia is the proverbial Lady in Red.

So, what’s not to love? Crocosmia has great flowers, great leaves, and brings hummingbirds to the garden. How could it be a problem? Well, in the U.S. and other parts of the world, this Southern African native is considered an invasive species because of how well it grows, to the detriment of other plants. It really can grow almost anywhere; the ‘Lucifer’ cultivar (which has made itself a regular feature of my garden) is hardy to Zone 4. In the words of the California Invasive Plant Council:

“It prefers disturbed areas, including roadsides, coastal scrub, prairie and forests. Crocosmia is a superior competitor for water, light and nutrients, and it excludes native plants by growing in dense patches.”

I’ve seen mass plantings of Crocosmia, which can be stunning:

Intentional Crocosmia planting, Japanese Tea Garden, San Francisco

But where not controlled, Crocosmia could run riot. It is a determined grower whose corms multiply and multiply. You may think you’ve gotten them all, but you haven’t. In my own garden, no matter how often I have tried to transfer rogue Crocosmia from where I do not want it to grow, to where I do, it keeps cropping up in the old spots — and in new ones.

Crocosmia in yet another unplanned spot

The reason I am finding it in new spots in my garden, is that — in addition to propagation by corms — Crocosmia can also grow from seed. I did not realize how sneaky and able Crocosmia was until now, so I naively let the seed pods develop and scatter, mostly because I did not perceive them as a threat. In my skirmishes with this flower (or weed?), it has outwitted me each time. I’ve been focused on battling corm-spreading Crocosmia, without realizing my garden was also being strafed by airborne seeds. Now I know I should have been cutting Crocosmia off at the pass, literally; I should have been cutting the flower stems at their base as soon as the flowers were spent. Instead, I have allowed the (admittedly beautiful) seed pods to develop, along with the mini paratroopers housed therein, just waiting to spread further red cheer throughout my garden. Clearly, I am no military strategist.

But… lesson learned for next year. I vow to be ruthless. Really.