helix consists of orthotropic self-supporting shoots, which bear flowers and fruits for reproduction. Juvenile shoots additionally occur in the form of “searchers” or vine tips-i.e., self-supporting tip regions of climbing axes (Gartner and Rowe, 2000). As they make contact with an adequate support, newly developed shoots grow as climbing axes, attached to the support via adventitious roots (Melzer et al., 2010, 2012). Typically, juvenile plant stems initially grow as prostrate, plagiotropic shoots on the ground, and this phase can persist for a prolonged time (Wareing and Frydman, 1976). Its phenotype is mainly characterized by differences in the morphology and growth habits of the juvenile and adult phases (Jones, 1999 Metcalfe, 2005). Ivy ( Hedera helix L., Araliaceae) is an abundant, evergreen, root-climbing liana, widespread across most of Europe and western Asia (Schnitzler, 1995 Metcalfe, 2005). helix axes with merged stem-branch attachment regions are comparable to other self-supporting plant species, despite anatomical and ontogenetic differences. helix branching with tropical Araliaceae, which do not show the described coalescence of woody strands to this extent. Of specific interest is the comparison of H. Mechanical experiments showed the tendency toward failure in the side branch with increasing fusion of woody strands, affected by the diameter ratio of the side branch to the main axis. helix ramifications results from accumulation of secondary xylem with age, influenced by mechanical stimuli causing specific loading situations during different growth habits. ConclusionsĬoalescence of woody strands in H. ![]() Biomechanical experiments in which the branches of stem-branch attachments were bent revealed two main modes of failure, breaking failure in (1) the attachment region and (2) the side branch. Three categories of woody strand coalescence were defined. helix exhibited a so-called “finger-like” branching morphology with abaxial branch lobes and varying degrees of fusion of woody strands. For bending experiments, 103 specimens with the self-supporting growth habit were collected. We decorticated and morphologically analyzed 300 samples of ramifications from prostrate, climbing and self-supporting axes of H. The present study focuses on its branching morphology and variations with age and change in growth habit, based on conspicuous stem-branch attachments previously described in related Araliaceae species. In ACT WA? We are unable to ship this product to you for state biosecurity reasons.Hedera helix is a striking example of a plant with morphological traits and growth habits that vary between juvenile and adult phases. The pot size is 80mm high and 42 mm wide. YOUR PLANTS: These plants are tube-stock plants, healthy young plants with new roots that will establish quickly in your garden. Growth can be prolific, cut back as required. Feed with a controlled release yearly during spring and follow up with liquid fertiliser monthly during Summer. Totally cold-hardy.ĬARE: Mulch and water regularly until plant becomes established. PLANTING: Plant in shade or filtered sun with plenty of indirect light. Excellent plant for wildlife, for safety, nesting, food supply. ![]() Good groundcover - will self-root along its stems. Enjoy indoors while plants are small (or regularly trimmed). Works well over archways, or as regularly-clipped topiary. ![]() USES: An ideal solution to unsightly fences and walls. When mature plants climb up a support and become tree-like, the leaves turn diamond-shaped and the plant will bear black berries in winter. APPEARANCE: Vigorous evergreen self-clinging climber with dark green tri-lobed leaves.
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