Tea and fungi

Chamomile tea prevents damping off—I’m a believer! It’s one of those natural but-do-they-really-work remedies, used where more product-minded folks would fork over a few bucks for a bottle of No-Damp fungicide… I brew up a batch of tea, dilute it by eye to a pale gold,  and apply every couple of days with a fine-misting spray bottle. I’m pretty casual about the recipe, and keep spraying until the seedlings are established (that’s my method, there are more precise instructions around as well, search online).

Damping off is the name for a bunch of different fungal infections that can hit seedlings in trays with similar effect. In my encounters, the damage appears right below the soil line, strangling the stem just out of sight. Dig up a stricken seedling and there’s a small section of the stem, all pale and shriveling to nothing, while above and below, all looks well (the symptom’s called “wire stem”). It’s pretty shocking to see in action. One minute, your seedlings are looking all perky, and then you touch one…and it topples over! Whooaa!

Up to a couple of years back, I’d lose a few seedlings, usually PEPPERS for some reason, never anything major, parts of a tray or two, but enough to be scary. I seed-start in soilless mix (so it should be disease free), trays and tools are given a good disinfection at the beginning of the season, there’s always plenty of air circulation, and I make sure the soil surface doesn’t stay wet—all the things these soil-borne fungi don’t like. Still, damping off was sneaking in, until chamomile tea spray came along… Coincidence?

Seedling treatment

The fan is oscillating and the grow racks are slowly filling up. Parsley—curly and flat-leaf—are underway, and there’s more lettuce and some herbs…

Fanning the seedlings is particularly satisfying because it does a lot for such a simple thing. I forget where I heard about it, probably from a book, and I’ve been doing it since Year 1 or 2.

The idea is that plants develop differently when they have to deal with wind, or rain, or otherwise being pushed about. Seedlings raised indoors lead an extremely sheltered life; providing a bit of a breeze toughens them up, and this sort of mechanical stimulation (brushing is another approach) also encourages stockier growth instead of stretching.

It makes sense to me—seedlings definitely wouldn’t be so coddled growing out in the field! There’s even a term for this: thigmomorphogenesis! While hunting down the word, I found an interesting article about mechanical stimulation of seedlings as well (and here’s another).

I don’t follow a particular schedule, just give ’em at least an hour or two a day, sometimes more, turn the fan on and move it around every once in a while (I also make sure the seedlings are properly watered, since wind is great for drying out plants).

All in all, it’s easy, sounds good, hasn’t hurt! The fanning also dries the soil surface, which helps prevent damping-off, so you can’t lose!