container plants

7 pots near the pond bench: 2 hellebores, 1 variegated hosta, 1 variegated grass, 1 blue poppy, 1 empty, 1 fragment

Going to Pots

A giant blue glazed pot, a big green and blue one from Vietnam, two ochre pots with brown Chinese dragons, curvaceous plastic urns from the Canadian Tire store, dozens of repurposed black nursery pots, terracotta pots in a vast range of sizes and states. Collectively, they are homes to mature hostas, standardized privets, auricula primulas, hearty tomato plants, perennials in waiting, small seedlings, and newly rooted cuttings.

Hosta in a big pot from Vietnam

Earlier this year, I did an inventory of the plants in my garden that are growing in pots. The total came to sixty-two. That was before I added nine tomato plants and a dozen or so young perennials grown from seed or cuttings. The current total must be around seventy pots.

Heuchera coral bells "Timeless Orange" and pot "Toga Bell Yama, olive black"
Glazed ceramic pots from Asia and a basic black nursery pot (on the right).

The pots vary in size from four inches in diameter to two feet. Most of the smaller ones are plastic — reused nursery pots. The biggest ones are wooden half-barrels and a couple of Chinese “egg jars.” At one time, these big clay jars were made to ship preserved eggs from China. Chinatown grocery stores sold the empties quite cheaply to gardeners and others as impressive large containers. I don’t think they’re as readily available now, so I’m grateful to have two of them. One is positioned near the pond and occupied by a Japanese painted fern (Athyrium niponicum). The other anchors a group of clay and ceramic pots near the front steps. It’s rather wasted on a plant of Dusty Miller. I really should think of a more worthy use for it.

Big Chinese pot ("egg jar") and small white ceramic pot
Big Chinese “egg jar” with dragon and white ceramic pot.

In addition, I have a few other glazed ceramic pots, ranging from large to medium size. Then there is a gang of the common unglazed terracotta pots from Italy. I like them, but they can’t be relied upon to withstand freezing temperatures. Eventually they crack and break, which is why I also have a shocking number of half-pots, quarter-pots, and a bucketful of potsherds. Plastic is practical but can look cheap and ugly, especially the nursery pots. They eventually get brittle too. I have a couple of good quality plastic pots that look like terracotta from a distance.

The two pots in front are plastic; the one to the rear on the left is unglazed terracotta; Chinese “egg jar” in the centre background.

Seven Truths About Pots

  • Pots provide plants with ideal little environments — the perfect soil and no competition from other plants, unless the gardener doesn’t bother to remove volunteers and weeds. I know this from experience, having lost a couple of potted lilies to hearty invaders.
  • Potted plants can be moved indoors or under some sort of cover for the winter months. This makes it possible to grow things like lemon trees in places with cold winters — as long as the gardener has the strength to move the pots, that is. I have a jade plant and a variegated weeping fig that summer outside. A special set of straps makes it easy less difficult to lug them in and out. The operation does take two, however.
  • Pots can be moved around to ensure optimal light exposure. They can be positioned strategically to enhance a planting when in bloom and whisked offstage when finished. But see above re lugging.
  • Pots need to be watered, sometimes as frequently as once or even twice a day, depending on weather and the size of the occupant. At its peak, a tomato plant’s roots totally fill the pot and pump through a lot of water, maintaining itself and plumping up the tomatoes. Forgetting to water, even for a few days, means rapid decline and death. Unlike plants in the ground, potted plants can’t put forth roots to seek moisture. They’re like caged animals that need to be fed.
  • Some woody plants (shrubs and trees) confined to pots stage breakouts by growing roots through the drain holes in the bottom of the pot. If the soil below suits them, they take off and grow. Forget being a potted subject. I’m a tree! The gardener must keep an eye on these sneaky individuals, and do some judicious root pruning now and then.
  • All gardeners acquire a shoal of plants in small pots — gifts from fellow gardeners, impulse buys, divisions, and “spares” of rooted cuttings or seed sowings. Very few plants will prosper indefinitely in a four-inch plastic pot. The gardener should have a plan for every one of these temporary pot denizens — a date by when it should be planted permanently, given away, or otherwise disposed of.
  • Permanently potted plants need annual maintenance. Fertilizer of some sort, up-potting or re-potting, trimming, etc. Some plants withstand being root-bound better than others. Delphiniums, for instance, need to be turned out of their pots annually, and then returned to them with fresh soil. Otherwise, the soil becomes compacted and the roots rot over the winter. Goodbye, delphiniums. But I can’t grow them well in the ground because they can’t deal with the maple tree roots. This year’s star specimen is five feet tall and has bloomed well. With the black pot hidden by other plants, it looks like part of the bed it’s in. (Just in case, I rooted a couple of its new shoots this spring. They are now potted up. Add two more to the inventory.)

Despite the above, pots (or, more broadly, containers) are an important feature of most gardens. They add life to hardscapes like decks and patios, and they make it possible to grow things not suited to one’s native ground. All gardeners want to grow stuff they can’t.

Potted delphinium in perennial bed
Five-foot-tall potted delphinium.
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Lily-flowered magnolia "Susan" in April 2014

The Rites (and Wrongs) of Spring

Spring has settled in and I’ve done the usual things associated with the season: edging the perennial beds, distributing enriched compost, cutting the grass, seeding tomatoes (indoors), cutting down old dead stuff, and, of course, pruning. Pruning is always a challenge, often involving ladders, rose thorns, and holly prickles. Then there’s disposal of the trimmed off stuff — more thorns and prickles.

But now all that’s done, and the deadheading and watering phase hasn’t started. The garden is looking pretty good (except for certain spots to a discerning eye). Time to list the good and the less-than-good (i.e. bad) things I’ve noticed so far.

The Bad

  • poppy pagoda to protect blue poppies from winter rainAll except one of the blue poppies (Meconopsis) perished over the winter, despite (or maybe because of) being transplanted to deluxe quarters in half-barrels last autumn. Even the specially built roofs on legs, intended to protect them from winter rain, didn’t do the trick. I think my mistake was the pea gravel mulch, which kept the soil too moist through the winter. The sole survivor looks a bit feeble, but I’m letting myself hope it will survive. Local nurseries don’t as yet have any plants in stock, but I plan to give this fussy species another try.
  • The reliable-as-furniture ferns (Dryopteris species and others) haven’t unfurled their fiddleheads yet. Usually by mid-April they are well under way. They’re alive but dawdling. Why? The past winter wasn’t that harsh. Could it be because I cut down last year’s fronds too early, before the last hard frosts?
  • A potted delphinium has, like the blue poppies, succumbed to root or crown rot, probably because I didn’t repot it into fresh, uncompacted soil last year. Delphiniums need that near-mythical combination of “moist but well-drained” soil. If they’re grown in pots, the gardener needs to keep in mind that the soil becomes dense and less well-drained over two or three years. The next winter administers the kiss of death. Goodbye, delphinium.
  • A couple of tulips appear to have “tulip fire,” a disease caused by the fungus Botrytis tulipae. They will have to be dug up and disposed of. This problem is new to me. Those particular tulips have occupied their spots for years — which, I understand, is the problem. The longer they remain undisturbed, the more susceptible they are. If I decide to replace them, the new bulbs will have to be planted in different locations.

The Good

  • The winter massacre of crocuses (most likely by rats) wasn’t as bad as I thought. Some areas escaped completely.
  • A potted hosta I thought was a goner after it was dug and dumped by some creature (probably a raccoon) has sprouted out nicely.
  • The pretty blue* bindweed relative, Convolvulus sabatius, has survived the winter well, unlike other years when it didn’t show above ground until June. I also have hopes that Gaura lindheimeri made it. I still don’t know why this plant, supposedly hardy to Zone 5 or 6, has a habit of dying here in Zone 8. My soil is sandy and well-drained, which is supposedly what it needs.
  • Daylily “Hyperion,” which I dug up and divided in February because it seemed to be in decline due to pushy maple roots, appears to be doing well, both in its old spot (from which I removed a lot of roots) and the two new ones.
  • Clematis armandii foliage and flowers in holly bush

    Clematis armandii and holly

    I managed to prune both Clematis armandii and the holly that supports it without inflicting major unintended damage to the clematis. It tends to grow in loops and figure eights, so if pruning is needed (best done as its blooming period ends), you can’t just snip anywhere. My rule is never to make a cut unless I can see the end of the thing being cut. There’s nothing worse than seeing a whole section of the plant wilting a few days later because of a blind cut.

  • After a dry March, we’ve had an abundance of rain in April. The real test, of course, will be June, July, and August. At least one of these months will be rainless. If it’s two consecutive months, there will be groaning and gnashing of teeth by this gardener.
  • The pink magnolia is blooming heartily. So are forget-me-nots and bluebells. And gentians, which are intensely blue.*
  • The apple tree and lilac have obvious plans to bloom soon. In general, the garden looks fine.

Back garden spring 2018 birthday birdbath

Part of the back garden, featuring the birdbath that was this year’s birthday present. A few birds have actually used it for bathing purposes.

April 6, 2016

Gentiana acaulis

* Like many gardeners, I have a thing for blue flowering plants, many of which are hard to grow (blue poppies and delphiniums, for instance). One type of gentian (Gentiana acaulis) seems to do fairly well here, and forget-me-nots are practically a weed. For them I am grateful.