Tag Archives: temperature

colder than alaska

It’s been a cool summer so far, following on the heels of a sunny but cool spring. I’ve been watching the temperatures in the paper for Fairbanks, Alaska, and most days the official San Diego report has been cooler. In fact it’s been cooler than almost anywhere in the US except for maybe Anchorage in Alaska. Brr.

At my July 4th party I was talking to someone there with ties to the Scripps Institution of Oceanography, and his thoughts were that this is typical for an El NiƱo year. The phenomenon that the locals call “May gray” would be slow to get started (as was the case this year), and the dreaded subsequent phenomenon the we call “June gloom” would drag on longer than usual. All that seems to be happening.

The garden natives don’t seem to be worrying about the temperature as much as I’ve been. In fact the late-spring bloomers seem to be having a field day, extending their bloom, looking nice at a time of year when they don’t always. Black sage is often done by this time, but there are a few lingering flowering stems.

For stunning flowers, though, the black sage has passed the baton to Cleveland sage. Here’s the common and gorgeous cultivar ‘Winnifred Gilman.’

…and here’s Winnifred in closeup…

One of local live-forevers, Dudleya edulis, has had one of the more amazing years that I can remember. Here’s an 18-20 year old plant from above, all covered with flowers. In this photo it’s sprawling six feet across from one edge to the other.

The same dudleya, viewed from ground level as it cascades over a short little retaining wall.

The San Miguel Island buckwheat that I grew from seed two years ago, Eriogonum grande var. rubescens, is finally hitting its stride, finally looking the photos I’ve seen in books. Maybe the cooler weather will keep it looking nice longer.

Among the many non-natives that call my garden their home, this is Clerodendrum ugandense, finally perking up after looking like a twig until late in May. I think it’s been a somewhat slow start for this plant this year, but it always waits until the weather warms to look like a plant you want to keep in the garden.

The common ornamental sage, Salvia ‘Hot Lips,’ is grown for its red and white bicolored blooms. I’ve heard that it blooms mostly with white flowers when weather turns cold. In the left photo these are the only two red and white flowers I could find on three plants. The rest of the flowers are white. In the depths of winter, however, this plant is often completely bicolored, so I’m not sure if there’s any truth to this color change rumor.

Some of the plants that I worry about the most are my American pitcher plants, these Sarracenia from the South, where the daily low temperatures these days are often running ten degrees above the San Diego daytime highs. Fortunately these plants seem to respond more to daylength than to temperature, and the plants look pretty good. Still, they might be taller by now where they originate.

Cool as the days may be, one thing told me for sure that I do not live remotely near Alaska. Monday night was the grand opening of the first giant bloom of this climbing cactus, probably Hylocereus undatus. Even if it’s probably been slow getting started this year, it’s probably the best proof that I’m overreacting. Hardy to not much below freezing, one hit of arctic cold and you’ll freeze this plant’s tuchas off.

At eight to ten inches across, the only shy thing about this plant is that it only opens as darkness approaches. People in cold climes covet being able to grow plants like this–or in fact many of our more tender California natives.

That’s definite proof, Dorothy. We don’t live in Alaska. It just might feel that way these cool summer days.

my favorite garden gadget

There are people who go gaga over gadgets, and then there are skeptical folks like me. If I buy gadget it really has to promise to do something I need it to do. (Case in point: I still don’t own an i-anything. No iPhone, no iPad, not even–gasp!–an iPod.)

But the gadgets in the garden that I really enjoy having are my two maximum-minimum thermometers. Imagine a device that tells you how hot and cold it got anywhere in your garden over whatever time period you like.

I have one in the greenhouse, where it tells me how hot the temperature got inside while I was at work. This is information you won’t get from a weather report.

You could also use a pair of them to identify microclimates around your yard and to answer specific questions like, Is the lower part of a slope more liable to get frost than the top? Or, how much temperature difference is there between the beds on the north and south sides of the house?

The versions I have are totally analog devices where the mercury in the thermometer pushes up a little piece of metal inside the glass column on both the warm and cold sides. To reset the thing you pull the metal pieces down from the outside using a magnet. Primitive, but effective, as befitting a device that was invented in 1782 by James Six.

Yes, I did say that the thermometers are filled with mercury. Mine are over twenty years old. Regulations in many places today would stipulate that the fluid be something more environmentally responsible, but the devices would function the same way. You can also get these in digital versions, as well as those that have a dial instead of fluid-filled glass chambers. (I generally find dial thermometers to be less accurate in general, however.)

There you have it. My favorite boring little device. You can’t use them to surf the web or make gelato. But then what use does a plant have with Hulu or Facebook?