Dutch garden refers firstly to gardens in the Netherlands, but also, mainly in the English-speaking countries, to various types of gardens traditionally considered to be in a Dutch style, a presumption that has been much disputed by garden historians in recent decades. Historically gardens in the Netherlands have generally followed trends from neighbouring countries, but from the Early Modern period, Dutch gardens were distinctive for the wider range of plants available over the rest of Europe north of the Alps, and an emphasis on individual specimen plants, often sparsely planted in a bed. In the 17th century and into the 18th, the Dutch dominated the publishing of botanical books, and established the very strong position in the breeding and growing of garden plants, which they still retain. They were perhaps also distinguished by their efficient use of space, and in large examples, the use of topiary (sculptured bushes and trees) and small "canals", long thin, rectangular artificial stretches of water. When a distinctively "Dutch" style is claimed, it generally relates to formal styles in large gardens in the latter part of the 17th century, stretching on for a few decades. Because the Netherlands is one of the most densely populated countries, gardens are generally small and because houses are placed right next to each other, there is not very much light available. From the 19th century onwards, Dutch gardens adapted to wider trends, mostly from England and France. Dutch gardens are relatively small, and tend to be "self-contained and introspective", with less linkage to the wider landscape around. From the late 18th century onwards, many or most large gardens in the Netherlands adopted the continental version of the English Landscape garden style, at least for the areas beyond the immediate vicinity of the house. There are also many woodland gardens from the late 19th and early 20th centuries. The history of "Dutch-style" gardens abroad perhaps begins in the 17th century. On the one hand these have a concentration on the display of specimen plants, initially often imported from the Netherlands. In larger gardens, canals and topiary are often found. However, both of these features may well have been imported to the Netherlands from France, and their appearance in England may have been from either or both countries. Evergreen hedges, rather than those of deciduous species such as hornbeam, have also been seen as a characteristic Dutch style since the 17th