Sunday, December 12, 2010

Rhododendron scabrifolium v. spiciferum



I think of these smaller bushes with smaller flowers as Azaleas, but I guess this is a Rhododendron. So many of these Rhododendrons are now in bloom at the UC Botanical Garden! It is not even winter yet! I guess when the rains start falling, some plants think it is time to get serious about reproduction. I could find nothing about this plant besides its description, so I will just say, it is beautiful to see all the flowres among the beautiful fall leaves.

Thursday, December 9, 2010

Arisaema



Weird flowers in the spring, stunning seed heads in the fall, arisaemas are not the typical pretty flower. In the same family as Calla Lilies, the flower has a similar structure, with a spadix in the center and a spath surrounding it. Here the spadix has matured into a seedhead with bright red fruits, and the spadix has dried up around it. This is one of many Arisaema species at the UC Botanical Garden.

Wednesday, December 8, 2010

Malus hupehensis--Tea Crabapple



Beautiful clusters of flowers in spring, lovely fall foliage, and shiny red fruit in winter. What is not to like? Well, the Tea Crabapple can get many diseases: apple scab, powdery mildew, fire blight, rust and leaf spot. Still disease resistant varieties are available. the Tea Crabapple grows about 20-25 feet tall, perfect for home gardens. Birds love the fruit. It is called a Tea Crabapple because the leaves are sometimes used to make tea. The fruit can be eaten, but it is sour. Sometimes real apples are grafted onto the rootstock. Come take a look at it at the UC Botanical Garden.

Tuesday, December 7, 2010

Acer palmatum--Japanese maple



People have said that the cold snap early this fall has led to especially nice fall colors. I agree! Trees all over Berkeley are especially beautiful this year, and the ones at the UC Botantical Garden are amazing. This Japanese Maple is one example. Japanese horticulturalists have been developing cultivars for centuries, and now hundreds are available. Wow!

Saturday, December 4, 2010

Dahlia imperialis?



Well, I guess nobody knows exactly what Dahlia this is, now blooming at the UC Botanical Garden, but D imperialis is close. I have often heard people call it Thanksgiving Dahlia or Christmas Dahlia because it blooms this time of year. The flowers may be pink or white, single or double, but his plant is TALL. Eight to Twenty Feet Tall! It grows easily in this area; all it takes is putting a section of the stem (which looks like bamboo) in the soil. It takes at least a year to get to blooming size, but then they take care of themselves. Some support can be nice, and they don't like a hot, dry location, so next to a fence might be good. Very easy and has beautiful flowers at a time of year when not much is blooming. A great addition to a bay area garden.

Friday, December 3, 2010

Sassafras Tzumu




Three types of leaves: football, ghost and mitten. Can you find them all in the pics? And beautiful fall color. Just proves that there is always something beautiful at the UC Botanical Garden. I've read that there are only two main species in this genus, S. Tzumu from China, and S. albidum from eastern North America. Main species? Maybe there are subspecies? There is also S. randalense. S. randalense and S. Tzumu are Asian and moneocious. S albidum is dioecious. They are all butterfly host plants. The American one hosts the spicebush butterfly and the Taiwanese one hosts the broadtailed swallowtail.

Wednesday, December 1, 2010

Tea is Blooming--Camellia sinensis




Tea is a camellia with small white flowers. Whole books have been written about camellia sinensis, but I will limit myself to a couple of paragraphs here. One of the most interesting stories is the one that links the industrial revolution to tea. Alan Macfarlane, an anthropologist at Cambridge University postulates that the IR would never have been possible without tea. For thousands of years, people who gathered in dense communities had problems with keeping the water clean enough to drink and suffered from dysentery and other intestinal problems. To avoid the sickness, they often drank a sort of "near beer," water with a small amount of alcohol in it to make safer. The problem was, drinking alcohol at breakfast, lunch and dinner makes people a bit dumb. But with the advent of tea, people could have safe water without the alcohol. The ritual of boiling the water kills germs, but the tea is also a sort of antibiotic. Thus, people could move to cities, remain healthy, and use the full power of their brains. In addition, workers who drank tea in the afternoon could work longer because the caffeine is a stimulant. Many factors played a part in the Industrial Revolution in Britain. Perhaps tea was one factor.

Tea contains the same stimulant found in coffee, caffeine. In tea, the highest concentration of caffeine is in the youngest leaves. That is because the caffeine is an insecticide and it protects the youngest, softest, most vulnerable leaves from insects. This also means that when harvesting, the best tea is made with the youngest leaves from the tips of the branches.

(Intoxicating Plant)