And so we reached Haverfordwest, enticingly situated at the tidal limit of the Western Cleddau river, a point marked by a weir with associated fish-pass.

Bridges are naturally a feature of a town on the river, ranging from old stone ones (the historic lowest bridging points of the river) to more recent railway and pedestrian crossings.

Tidal waters mean both trade and power: trade in the form of former warehousing and wharfage, power in mills, or at least the mill races and leats that extend upstream. And it seems that the County Hall may have been built on or close to a former mill, to judge from various road names and the watercourse issuing from beneath the building.

Although completed  as recently as 1999, County Hall is really quite spectacular in its clean design of interconnected bastions.  What’s more, it is covered in Swift-boxes (with associated screamers). All credit to Pembrokeshire County Council, even though we didn’t actually see any Swifts in the airspace; however the meadow lawns around the building did have Southern Marsh Orchids!

Well provided with riverine walkways, we headed upstream where the still waters were producing squillions of mayflies, some of which were being snapped up by swooping Swallows and House Martins, or by fishes from below with an audible plop.

The dense vegetation harboured all sorts of interest, from beetles (Green Dock Beetles, both adults and larvae, were very numerous), to moths both large and small (Flame Shoulder and Woodland Sedge-moth, the latter according to the NBN found nowhere nearer than Llanelli) and galls (Dasineura ulmaria on Meadowsweet):

And then downstream, again very green, but interesting also where the river walls have ferns like Maidenhair Spleenwort, and an abundance of tenacious Alder and Buddleia saplings sprouting from the cracks. Even this far on the fringes of the nation, the leaves of the latter show signs of infection by the newly arrived Melon-Cotton Aphid, and they were also being eaten by Mullein Moth caterpillars. While this a known food plant for this moth, we have never seen it using it before. There were also lots of Two-spot Ladybirds and an Oncopsis planthopper, as well as an array of caddisflies, reflecting the high water quality: here are the Welshman’s Button and Black Silverhorn.

 

At the edge of town, we had a look round the tumbledown Haverfordwest Priory, dating back to around the start of the 13th Century, and featuring what is claimed to be the only surviving ecclesiastical medieval garden in Britain, replanted to resemble its look and fragrance in those times. Nearby wall-tops were covered in blankets of Mouse-eared Hawkweed, showing well the shagginess and stoloniferous habit.

Thence to the Priory Saltings nature reserve, the lower sections of which are tidal reedbeds. Along with masses of Hemlock Water-dropwort: we saw this plant everywhere we went during the holiday. But only here was it being demolished by the larvae of the micromoth Depressaria daucella (Water-dropwort Brown), and as-yet-unidentified spindle-shaped galls in the primary umbel spokes.

Other wetland plants in flower included Ragged Robin, Brooklime and Celery-leaved Buttercup.

The higher, drier areas had a mixture of scrub and species-rich grassland…

… which of course provided good insect habitat, including the micromoth Pammene aurana, not recorded on the NBN any nearer than Carmarthen.

The higher parts of the town have some lovely narrow, historic streets…

… along with several churches on some of the highest points. Best of all, now a private residence, was St Thomas A Becket, immersed in a churchyard of managed wilderness.

One final high point is the site of the ruined castle, with no public access apart from the southern slopes that bring wild flowers and insects into the heart of the town.

Haverfordwest was a great base for a couple of nights, in the comfortable, friendly County Hotel, very convenient for the station. And plenty of places to eat, best of which was the extremely welcoming Bristol Trader pub.

It is also, without any hint of a slight, a great place to get out of: the gateway to even more far-flung lands using the remarkably efficient bus service, as we will see in the next blog….