Deep Drip Watering Stakes help you water, aerate, and fertilize your trees and shrubs at the root. The Deep Drip tree and plant watering system saturates the ground allowing the roots to grow deep and strong. Hard cap won't break even with a large hammer and uses UV protected plastic to prevent cracking or weathering.
From Deep Drip Instruction manual (comes with each stake):
"New Tree Installation: After your tree has been placed in the hole, insert 2-3 Deep Drip stakes vertically in the hole surrounding the tree. The stakes should be placed close to the root ball, without going into in to the root ball, before back-filling with soil. The top of your Deep Drip stake can either be above ground level (recommended) or below ground, depending on your preference. This of course is the easiest method of installation.
Existing Tree Installation: Since your tree is already in place, we recommend inserting a minimum of 2-3 Deep Drip stakes vertically around the base of your tree. On your existing tree, the stakes should be placed between the trunk of the tree and sit just inside the drip line, also known as the trees canopy. For best overall coverage, using 3 stakes placed on a triangular pattern is what we recommend. If you have a more mature tree and you feel your tree needs more water, you may choose to use additional stakes. As a guideline, look at the size of your trees canopy and consider placing the additional stakes every 4-5 feet apart, all around the base of your tree. This is just a guideline and we trust you will make the best decision for your plant. The top of your Deep Drip stake can either sit above ground level (recommended) or below ground, depending on your preference.
Hammer Deep Drip completely into the ground or leave the cap and top hole visible, whichever is preferable....
...Drip Line: When positioned in the ground, remove cap and insert end of existing drip line with selected emitter attached into the shaft aligning the drip line with the slot in the cap. Re-install cap to secure drip line and stop excess debris from entering the shaft"