I have a 'thing' about hopeless dibbers which, to me, are just not fit for purpose, so I've equipped myself with the 'Walking Stick' one below that enables me to 'dib' holes without bending my back (useful when planting out 80-100 leek seedlings) and I also use it for watering individual plants, viz:
Once the planting is complete, and particularly in dry
weather, the Walking Stick dibber (80 cm tall)can be employed to make deep (30cm) holes
alongside each plant (above if the ground slopes). Then, using a conventional spray with the
nozzle set to emit a fine jet of water, one can run down a longish row in ten
minutes or so, filling each hole with water that will arrive in or below the
root system where it will be accessible to the plant, but not any invading
weeds. Should additional feed be
required at this stage, either drop in a few granules first or mix liquid feed
with the water.
Buying the good lady a suitable fitting for her hose, possibly with a custom made dibber, could be the answer. This is all part of a thesis on the accursed dibber and the item on the left does square holes for plants bought in trays.