ice stars

'Ice stars' or 'Lake stars' develop under very specific early winter conditions. 

First, a cold snap that freezes the pond ice an inch or two thick, followed by warmer days that bump the ice temperature above 32F. Pores form in the ice sheet where there are any imperfections in the water surface (plant matter, logs). Then, some snow falls with a cold front blowing in.  Warm water wells up from beneath the thin layer of ice, covered with a coating of snow and slush.  Temperature and precipitation have to be perfect for this to happen. 

early purple ivy blooms

These lovely purple flowers are loved by bees. The early blooms help feed insects before a lot of other flowers open. This 'ground ivy' has a long history of medicinal use. It is usually evergreen throughout winter if covered by snow. Part of the mint family of plants, it is also aromatic.  

Some lawn owners know it as a pest, and call it 
creeping charlie, gill-over-the-ground, alehoof, 
tunhoof, catsfoot, field balm, or run-away-robin.
I admire the shape and texture of the leaves, and 
used them in a botanical design project.

stars on ice

Another interesting feature of winter on the pond is the 'ice star'  or 'lake star'.  In my search for information about these patterns, I found many theories -- all related to the physics of temperature, moisture, pressure, and ice formation.  One of these theories is that patterns are formed in early winter when a hole allows water to swell up from beneath and spread over the surface, leaving dark fingers of melted ice radiating from the hole.