The Running Hare [reviewed prev] is all about a quixotic project to see if a farmer can grow wheat in 21stC England without killing everything that isn't Triticum aestivum. Everything dead includes all the worms which aerate the soil and all the microbes which release minerals and micro-nutrients from the subsoil. The standard practice is to spray 2,4-Dichlorophenoxyacetic acid aka 2,4-D when green starts to show after sowing - that will kill all the dicots and make the whole field monochrome - you can't eat poppy Papaver rhoeas, speedwell Veronica persica, cornflower Centaurea cyanus, mayweed Anthemis arvensis, corn marigold Glebionis segetum; Scarlet Pimpernel Anagallis arvensis, cleavers Galium aparine, or colt's foot Tussilago farfara . . . so caedite eos kill them all.
Another [not-a-dicot] weed in among cereals is/was darnel Lolium temulentum, a close relative of Lolium perenne [prev] which is the current King of Pasture Grass. In olden days, darnel was a persistent pest because it was very difficult to clean its seed from the results of last year's harvest. Looks like wheat, quacks like wheat etc. especially before the seed-head appears but after it could be hoed out as an unwelcome interloper. When the seed corn was broadcast the next Spring, darnel was inevitably included in the mix and would compete for some part of the field's fertility. But it was not just a passive consumer of nutrients because Neotyphodium spp., endophytic fungi commensal with darnel produce lolines, a variety of hallucinogenic toxins. These natural chemicals are good for darnel because they incapacitate several insects which like to consume grasses.But lolines also incapacitate humans who ingest too much of the stuff as they loll about seeing things and behaving as if drunk [on ethanol]. Too much loline has been known to be fatal. But seeing visions and being in an altered state of mind has a long tradition of being embraced rather than avoided . . . at least for some people [priests, shamans] at some times [Saturday night, when you're coming up blank for tomorrow's homily]. Sid Thomas from Aberystwith U published an interesting tribute to Lolium temulentum and that plant's place in history.
- Those tares, which featured in the bible? That's Lolium temulentum.
- The Danes who were sprouting like cockle amongst the wheat before the early ethnic cleansing of the St Brice's Day Massacre? They were metaphorical Lolium temulentum.
and now, in its turn, darnel has been condemned to the dustbin of history at least in the developed world. The relentless, indefatigable drive for wheat monocultures has put darnel on the red list of endangered species because it only really knows how to thrive in wheat fields where every year provides a bare-field head-start. In other weedy communities - road-verges, for example - darnel just doesn't have to chops to compete. You'll have to look long and hard to find darnel in Ireland nowadays.