Watering
Young Trees
Younger trees need a more consistent watering schedule in comparison to older trees. Around 1-2 weeks after planting a tree water it daily. Then 3-12 weeks after water every 2-3 days. Finally, after 12 weeks water it weekly for 3 years or until the roots are established.
If you aren't confident in your ability to water as rigorous as needed, consider using a watering bag or donut! These items will water your tree slowly. Keep in mind they should be on in the spring and summer only when we do not receive 1 in of rain within a week. They also should be unzipped between waterings to prevent damage to your tree. Bags should be taken off in the fall to prevent freezing.
Established Trees
If there has been a lack of rain and you are concerned about it receiving enough water, there is a way to check. Try slicing into the soil near your tree (be careful of the roots) and feel if the soil 6-9 inches deep is moist or dry. If the soil is dry that means your tree needs water. It's recommended to use a sprinkler to water your plant to prevent over watering but continue to water until the soil is cool and moist 6-9 inches deep.
Tree Guards
Tree guards assist in preventing young trees from deer damage, but they can damage your tree if the proper precautions aren't taken. Tree guards should be removed in the spring and then placed back on in September to thwart off fungal growth and earwigs. This process should be done until the tree has reached 3.5-4 inches in diameter.
Mulch
After planting and till it's an established tree, mulch volcanos should be avoided. The infographic has a great visual example of the desired mulch donut vs. a mulch volcano. Mulch has many advantages for trees, but mulch volcanoes can block these benefits, so when checking on your tree be sure to check your mulch too.