Monarchs laying eggs on midsummer milkweed
June 30, 2026
Along the open edges of Sandy Creek Park, where the tree canopy gives way to sun and the ground stays dry enough for forbs to take hold, common milkweed grows in loose stands. The broad, paired leaves are fully out now, thick and waxy, and the pink-purple flower clusters are either open or just finishing. This is the plant a female monarch is looking for.Monarchs are in the middle of their breeding season here in the Durham Piedmont. The females moving through these open areas are not wandering. A female monarch locates milkweed partly by sight and partly by contact: she lands on a leaf and drums it with her forelegs, which carry chemoreceptors sensitive to the compounds in the plant's surface. If the leaf registers correctly, she curves her abdomen and deposits a single egg on the underside, pale green and ribbed, about the size of a pinhead. Then she moves on. She may lay several hundred eggs over her lifetime, almost never more than one per leaf, distributing them across multiple plants. This spreading matters. A caterpillar that exhausts one plant's leaves before it finishes developing will not survive, and there are no other options. Milkweed is the only plant monarch caterpillars can eat.The reason for that exclusivity runs through the plant's chemistry. Common milkweed produces cardenolides, a group of compounds toxic enough to stop the heart of most vertebrates that ingest the leaves in quantity. Monarch caterpillars have a version of the cellular pump that cardenolides normally disrupt, modified just enough to tolerate the toxin. They do more than tolerate it: they store it. A caterpillar that feeds on milkweed accumulates cardenolides in its tissues, and that toxicity carries through metamorphosis into the adult butterfly. A blue jay that catches and eats a monarch typically vomits within minutes and avoids the orange-and-black pattern afterward. The monarch's coloration is not incidental to this. The pattern is a signal, and it works because predators learn it. Pearl crescents and silver-spotted skippers also move through these open areas right now, but they draw no such avoidance. They are palatable, and birds take them. The monarch's relationship with milkweed is what separates it from those other butterflies.Milkweed does not simply sit still for all of this. The plant invests heavily in its cardenolides, and some individuals produce more than others. Milkweed also has latex, a sticky white sap that runs through channels just under the leaf surface. A small caterpillar that bites directly into a leaf vein can be immobilized by the flow. Experienced caterpillars, even early instars, often cut a circle of veins before feeding, severing the latex supply to a patch of leaf before eating it. This is not learning in the way we typically use that word; it is a behavior that appears early and reliably. The plant and the insect have been working against each other for a long time, and the marks of that are in what each one does.Monarchs are a threatened species, and the pressures on them are real: habitat loss along the migration corridor, declining milkweed in agricultural landscapes where herbicide use has reduced it sharply, and climate variability affecting the timing of migration and breeding. What happens in patches like this one, at the weedy margins of parks and roadsides in the Piedmont, is not trivial. A female laying eggs here in midsummer is contributing to the late-summer generation that will eventually make the long flight to Mexico. That generation is not born yet. Right now it is an egg smaller than a sesame seed, tucked under a milkweed leaf in the full heat of the afternoon.If there is milkweed near you, look at the undersides of the leaves. Run your eye along the midrib and out toward the edges. The egg, if it is there, is cream-colored and faintly ridged, sitting upright on the leaf surface. The leaf itself is warm from the sun.
Drought breaks in a single week as streamflow spikes across the basin
August 3, 2026
The drought gripping this part of the Piedmont collapsed almost overnight. Since early June the area had been locked in extreme to exceptional drought, with the most severe category holding at nearly 96 percent coverage for four straight weeks running. As late as this past July the area remained entirely in moderate drought or worse, with over 80 percent of it classified severe or extreme. Then, in a single reporting week, the severe-and-worse categories dropped to zero and moderate drought coverage fell to under 18 percent.The stream gauges tell the same story with more precision. Flow across the Triassic Basins watershed, from Goose Creek to Third Fork Creek to the Eno River, had been crawling along at a fraction of a cubic foot per second for most of the past ninety days. The most recent reading hit 14.7 cubic feet per second, the highest of the entire record, arriving in exactly the week the drought maps broke. That pattern, a flat and starved baseline followed by a sudden spike, is the signature of a sharp storm ending a long dry spell, not a water table recovering gradually from below.What that first flush carries downstream is worth watching closely. Third Fork Creek, Ellerbe Creek, and Little Lick Creek, all now running with this new pulse of water, are already listed as impaired under the Clean Water Act. Months of low, warm, oxygen-poor flow tend to let fine sediment and adsorbed pollutants settle quietly into the streambed; a first-flush surge like this one is exactly the kind of event that can scour that material back into suspension, dropping oxygen and clouding the water even without any new source of contamination. Of the eleven permitted dischargers in the watershed, one currently has a flagged violation of its permit limits, though none have risen to the level of formal significant non-compliance, so there's no single clear culprit pointed to by the compliance record \u2014 but the hydrology alone makes the next few weeks here worth a closer look.
Drought maps clear fast, but Piedmont creeks haven't caught up
August 3, 2026
The drought monitor and the creek gauges are telling two different stories in the Triassic Basins watershed right now, and the gap between them is the real story. The surrounding county spent five straight weeks under Exceptional Drought, the most severe category the U.S. Drought Monitor recognizes, with the designation covering nearly the entire county through early July. Then conditions broke fast: coverage fell to 34% by mid-July, to zero by July 21, and this week only about 18% of the county sits in Severe Drought or worse.The small Piedmont creeks that feed this system haven't caught up to that recovery. Gauges on Third Fork Creek, Sandy Creek, Goose Creek, Ellerbe Creek, and the Eno River all spiked with the rain and are already receding back toward drought-era lows; the July 31 reading came in near the bottom of the past month's range, with gage height still below its 30-day average.That's the ordinary signature of headwater streams in this region. Rain moves through fast rather than soaking into the ground and recharging base flow, so the drought monitor can clear out on paper while the creeks themselves stay stressed underneath. For the cool, well-oxygenated riffle habitat that sensitive aquatic species depend on, a quick rebound in the official drought category doesn't mean the water has actually returned to where it needs to be. Whether these flows stabilize or slide again as summer heat keeps pulling moisture back out of the system is worth watching closely over the coming weeks.
Comments
No comments yet — be the first to say something.