Tomato stand-alone or multiple-bay greenhouses is on the increase, providing fruit during those times of the year when field-grown fruit is not readily available. Smaller sized fruit (cherry and grape), or cluster tomatoes (fruit-on-the-vine) are the fruit of choice for the large commercial greenhouse operators while the beefsteak varieties are the choice of owner-operator growers. Hydroponic technique is often used in hostile growing environments, as well as high-density plantings. To facilitate transportation and storage, tomatoes are often picked unripe (green) and ripened in storage with ethylene. Unripe tomatoes are firm. As they ripen they soften until reaching the ripe state where
Plum cake to as "Pflaumenkuchen" or "Zwetschgenkuchen". Other plum-based cakes are found in French, Italian and Polish cooking. The term "plum cake" and "fruit cake" have become interchangeable. Since dried fruit is used as a sweetening agent and any dried fruit used to be described as "plums", many plum cakes and plum puddings do not contain the plum fruit now known by that name. (Plum pudding is a similar, richer dish prepared with similar ingredients, cooked by steaming the mixture rather than baking it.) The term "plum" originally referred to prunes, raisins or grapes. Thus the so-called plums from which English plum