Spathiphyllum

It has been bitterly cold here for the last few days, with temperatures dropping to -8° at night. And we're not even officially into the three "days of the blackbird" at the end of the month, traditionally always the coldest of the year. (Why "days of the blackbird"? I blogged about it a couple of years ago. You'll find it here)

So I've found myself putting off the clearing up jobs that are waiting for me on the balcony, and I've spent the time giving my houseplants some TLC instead.

I have very few in the flat. It's quite dark, and most plants suffer from the lack of light. In the summer, in fact, they stop being houseplants and go out on the balcony, but in winter have to come in to protect them from the cold. But I do have a bit more luck in my office.

One of my favourites (apart from my beloved Pothos, Scindapsus or whatever you want to call it) are these little Spathiphyllums, Peace lilies. I got them last autumn (a present from some students - thank you Module 3 people) and they've been super all winter, blooming their little hearts out.

Native to the rain forests of Central and South America, Spathiphyllum thrives in slightly shady conditions. And so is well at home in the office where, except on the sunniest days of summer, I need a light on constantly. Being a tropical plant, it does like to stay warm though -keep it at over 15°C (60°F).

They come in all sizes from small to medium to large. I'm not sure what this one is. Possibly Spathiphyllum wallisii "Chopin", a dwarf cultivar. It's tiny in comparison to other spathiphyllums I've had in the past.

As a rain forest plant it likes to stay moist - though not soggy. Let it dry out and it will flop horribly. Don't panic however - as long as you catch it quite quickly and water well, it will pick up again as if nothing had happened. It's only fainted.

Like all houseplants, it needs to be kept clean. If the leaves get dusty then their stomata ( the plant version of skin pores) get clogged. Plants absorb sunlight and carbon dioxide to create their own food in the form of sugars, releasing oxygen as a waste product. This process, called photosynthesis, is impossible (or at least inefficient) if the stomata are clogged, and the plant will suffer (wouldn't you?).

Plants growing outside will be washed regularly by the rain, but in the house (or on a balcony) they need cleaning regularly. Use a soft sponge or cloth dipped in tepid water. You'll usually be horrified at how much muck comes off.

Smallish plants with tough leaves (like Scindapsus) can also be popped into the sink under a gentle stream of tepid water and given a shower. This is also a good way of getting rid of any pests like aphids and the dreaded red spider mite. Make sure though that any excess water that gets into the soil is allowed to drain off immediately.

How do you water your plants when you're on holiday?

If you garden on a balcony where the rain never reaches, going on holiday means you have to find some way of getting water to the plants when you're gone. There are lots of possibilities - get a plant sitter, buy those special gels that dissolve into the soil providing moisture, get an automatic watering system - but they've all got disadvantages.

Plant sitters first of all. Unless they're really gardeners, they tend to overwater - so you come back to drowned plants sitting in saucers of water. I know - I've tried that one. And unless they're friends or relatives who you can do the same for while they're away, you have to pay them. And that can work out expensive.

So do the gels. They work - I've used them in the past. But at €3 a tub, they're really only an option if you have the odd houseplant. I worked out that I'd need seventy of them to do the whole balcony...

Then there are those systems where you have a water container with capillary matting or tubes running into the pots. Again, less feasible if you have a lot of plants spread out over three long balconies as I do.

Then this year I found these. Ceramic spikes that fit into an ordinary mineral water bottle. Turn them upside down and the water slowly permeates through. I bought a couple, and they do work - on my "test run" I gave the plants no other water for ten days, with temperatures between 25-30°C (77-86°F) each day. They were fine, and the bottle was still a third full at the end. So they could easily have gone on for a fortnight.

But again they're hideously expensive - €7 for two, and I needed seventy. So I tried Amazon and found something similar (though not quite so classy). Plastic spikes that release the water drip by drip.

They're still not giving them away. But unlike the gels, you've only got to buy them once, and can reuse them again and again. Which means that the initial outlay is a bit less painful to contemplate.

The only real disadvantage if you want to use them in quantity, is that you have to save and store bottles for months before you leave. We were getting to the point that every time you opened a cupboard a score of plastic bottles would fall out...

When I went on holiday, the balcony looked as if I was running a bottle farm. But who cares - I wasn't there to look at it.

If you want to try them...