What Clematis 'The President' Looks Like . Showy, spherical, puffy seedheads succeed the blooms in this genus. Clematis does not tolerate consistent additional fertilizer in the same extent as competition standard roses. Most species are known as clematis in English, while some are also known as … This surely does not come as a surprise for many individuals because the clematis bloom is renowned for its ability to travel. Therefore a balance is necessary to achieve optimal clematis flowering. By contrast, sweet autumn clematis (Clematis terniflora), for example, has much smaller blooms, although, to its credit, they are more numerous. Opening pale yellow, the rounded, overlapping petals are adorned with pale chartreuse central bars. Too much nitrogen in the soil from applying fertilizer too frequently or in too great a concentration promotes foliage at the expense of clematis blooms. across (12-15 cm), that they cover the foliage entirely. Clematis can take a year or two to bloom after first being planted, and will require at least several more years before reaching full maturity. For example, some groups require a frost-free location while others will not bloom without a winter chill. It’s all about that pronunciation. Other varieties bloom on the current year’s vine, so they can be cut to the ground every spring. Durand clematis (Clematis durandii) also bloom on new wood, but unlike most clematis they are more compact plants, described as either nonvining or less vigorous, with blue flowers that can range from lavender to indigo. Some clematis varieties bloom on the previous year’s vines, so heavy pruning in spring will prevent new blooms from developing. Clematis is a genus of about 300 species within the buttercup family, Ranunculaceae.Their garden hybrids have been popular among gardeners, beginning with Clematis × jackmanii, a garden standby since 1862; more hybrid cultivars are being produced constantly. They are mainly of Chinese and Japanese origin. As the blooms mature, they fade to creamy white and contrast pleasantly with the prominent yellow anthers. The flower works its way climbing up to attain a certain level of height, after which it positions itself comfortably. A magnificent large-flowered variety, Clematis 'Guernsey Cream' produces such an abundance of luminous flowers, 5-6 in. This climbing vine is a large-flowered variety (6 to 8 inches in diameter). Iowa State Extension's Cindy Hayes notes that the attractive blooms begin in early summer and can continue until frost. A lot depends on the age and health of the plant you purchased, the growing conditions you provide for it, and how fast it's able to establish roots after being planted. If you aren’t sure, don’t prune the vine until later in the spring, when you can easily determine new growth from older, dead growth. The second is which particular clematis you select from one of the 18 different Clematis Groups (to find more information about Clematis Groups visit: J. van Zoest Clematis) because within these groups there are inherent factors that affect how they will grow in your garden.