This is a clump of Impatiens stenantha that is out of place. It's current situation is perfect at this time of year but in summer it's a devil to keep alive. It's between the path and the bottom greenhouse and it's just too sunny there with the sun's direct rays added to the reflection from the green house. The poor thing needs constant watering or it starts to shrivel. Being in a sandy soil doesn't help either regardless to the amount of spent compost we've dug in over the years.
You can tell the hose has been busy with the size of the clump.
I'll have to move it to a shadier location and perhaps then we'll see more of these pixie hats.
I split the plant and re-sited to two small areas down by the Fernery. It's pretty shady there and there were the two bare areas available. Now in my garden plants tend to grow into each other. The Impatiens has taken a deep breath and so far is holding its own. It seemed at first it could be overwhelmed but it is now showing above the other plants. There's also a lot just out of view below the canopy. I left a small piece in the original site as it was mixed in with other plants and that is now reclaiming its area too.