Wooden obelisks suit almost any garden design. Use them draped with clematis or other flowering climbers to add height to a border, as a feature to flank an entrance or to create a focal point at the end of a walkway.
When to Start: Any time
At Its Best: Depends on the plants' best seasons
Time to Complete: 1-1/2 hours
First, make templates for the sides. Drive two screws halfway into a remnant, 5 inches apart, for the top of the obelisk. Drive two screws halfway into a second remnant, 20 inches apart, for the bottom. Lay remnants parallel to one another, 8 feet apart. Place two upright timbers between them to create a quadrangle shape.
Bring the top ends of the upright timbers up against the screws in the top remnant template, as shown. Repeat at the other end of the timbers, butting these up against the screws in the bottom remnant template.
The uprights now form a fat triangular shape. Lay a piece of batten across the uprights, 12 inches from the bottom ends. Using the drill with the countersinking bit, make holes in the batten and uprights, and screw them together.
In the same way, place a small remnant for the plinth at the top of the two uprights (narrow end). Make four holes, two in each upright, and screw the plinth into place to secure the top.
Following the instructions in Step 3, screw more battens in place at 6-inch intervals, from the base to the plinth, to create a triangular, ladderlike structure.
Using a saw, trim the battens flush with the sides of the uprights. Repeat Steps 2 to 5 to create a second ladderlike structure and trim the battens. Treat both with a wood stain or preservative.
Fit the two sides of the obelisk into the two templates, as shown here. Then, screw in a piece of batten between the two sides to start forming the third side, lining it up with the existing battens. You may find this easier if someone holds the structure to keep it stable.
Work your way up the third side, screwing the battens carefully into place, and then repeat the steps for the fourth and final side. Trim all the battens as described in Step 6.
Screw in remnants to complete all four sides of the plinth. Measure the top and cut a square to fit. Stain it and, when dry, screw it into place in each corner to form a cap.
Wooden finials are available in various styles. Here, we have used an acorn. Stain the finial and screw it into the center of the cap.
To complete the project, stain the remaining battens and touch up any missed areas. The stain or wood preservative will prevent decay and prolong the life of the obelisk. Reapply it every couple of years in early spring before clematis and other deciduous climbers start growing. Secure the obelisk in place either by burying the bottom 4 inches of the structure in soil or by using custom fence post supports.
Excerpted from How to Grow Practically Everything
© 2010 Dorling Kindersley Limited