It doesn't get much simpler than pea sticks. When something straggly needs supporting make a wigwam or lattice of sticks stuck into the soil. Climbers will latch onto them and start climbing. Pea plants are a case in point hence the name.

 In fact the plant in the large tub is Everlasting Sweet Pea (Lathyrus latifolius) rather than the vegetable but the principle is the same. The natural habit of L. latifolius is to climb and scramble and needs something to support it.

 Hazel is the traditional choice for durability and flexibility but here I just gathered a miscellaneous collection of sticks that were lying nearby.