An artificial Christmas tree includes an elongated trunk extending between proximal and distal ends thereof. A base may support the trunk of the artificial tree in an upright position relative to floor. The proximal end of the trunk may be coupled to the base and the distal end of the trunk extending outwardly from the base. A plurality of frame sections may extend circumferentially around the trunk and being moveable in an axial direction relative to the trunk. Each frame section may extend longitudinally between axially spaced apart ends thereof and being connected with at least one other frame section, whereby axial movement of a given frame section along the trunk causes corresponding axial movement of each other frame section to which the given frame section is connected.

A base unit for an ornamental tree is provided that includes a ground support portion adapted to rest upon an underlying surface. The base unit of further includes an adjustable riser attached to and extending upwardly from the ground support to terminate in a distal end portion, the distal end portion of the riser being configured to support a trunk of the ornamental tree. The adjustable riser comprises an adjustment component to adjust the height of the ornamental tree between the ground support portion and the distal end portion of the riser between a first and a second height.

A base unit for an ornamental tree is provided that includes a ground support portion adapted to rest upon an underlying surface. The base unit of further includes an adjustable riser attached to and extending upwardly from the ground support to terminate in a distal end portion, the distal end portion of the riser being configured to support a trunk of the ornamental tree. The adjustable riser comprises an adjustment component to adjust the height of the ornamental tree between the ground support portion and the distal end portion of the riser between a first and a second height.