Thursday, July 29, 2010

Sedum rupestre 'Angelina'


Many years ago, I first happened upon Sedum rupestre growing happily in the garden of a bed & breakfast where my wife and I were staying. When I commented on how interesting the arched flower spikes were, the garden owner, who did not know the species name, encourage me to take a few pieces home.

At the time, I was growing Sedum reflexum 'Blue Spruce', a cultivar that looks very similar, so I was careful to plant this new introduction some distance from the other. Out of flower they are very hard to tell apart, and both have yellow flowers. It is the flower spikes themselves that makes identiy easy (S. reflexum flower spikes are upright from start to finish).

Subsequently, we came to plant this golden form on S. rupestre in the raised planter you see here, topped with a rusty iron grate, the golden-green color making a nice contrast to the dark iron as well as the darker foliage all around. You can see the normal gray form of the species in the foreground. I was pleased to see the flowering this spring - a means to verify that 'Angelina' is indeed a cultivar of S. rupestre (it is sometimes listed erroneously as another species).

Sunday, July 11, 2010

A typical July day here in Berkeley


© MMIX Earth Environment Service (annotated by me)

Folks are often perplexed by our local ocean fog. Even though it is easy to conceive that it has evil intent (we just saw it stay offshore until just before 4th of July fireworks were scheduled to go off, where it rushed onshore!), it happens for reasons that are pretty easy to understand.

The Pacific Ocean is a relatively cool body of water, which moderates our coastal environment, keeping it from becoming too hot in summer as well as too cold in winter. Our interior valleys, far from this influence, do experience much warm summer temps (and colder winter lows). As this warm interior air rises (orange arrows), it creates a vacuum that pulls in air from surrounding regions. Often this replacement air comes from the coast, pulling the ocean fog (created by the cooler ocean) along with it (blue arrows).

Sights of fog spilling over our coastal hills are very familiar to long time residents. Sometimes when a warm inversion layer holds the fog down, this cool air can only come in through the lowest points. The main 'low point' along this part of California coast is the Golden Gate, which is why it is so picturesquely half-shrouded in fog. Where does the fog go as it spills through this opening? First stop is Berkeley, where we live! I work in Oakland, which often warms up during the day in July, but back home in Berkeley, the fog can sit all day. My tomatoes are not particularly happy right now, and the rose is developing mildew, and many other warm-loving plants are in a sort of suspended animation, waiting for the occasional warmer day. But those that DON'T like the heat are enjoying a longer season that otherwise!