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Timing is key when determining the best time to hydroseed your lawn. It’s best to hydroseed in the spring or fall due to the already wet conditions of your lawn and the more mild temperatures. 

Your local pro will also offer watering and fertilizer instructions for the months after your application. Make sure you will be available to water it consistently, especially in the first two to three weeks for best results.

Mid to late spring is the best time of year to mulch. If you do it too early in the spring, the mulch could slow down the warming process of the soil and affect how well plants grow. By mid to late spring the temperatures are usually steadying, making it an ideal time to spread mulch.

Depending on the size of the river rock and the density of your soil, add woven landscape fabric or sand under river rock. The extra layer will ensure your river rock sits evenly and doesn't create puddles or uneven areas throughout the design. In some cases, nothing is necessary beneath river rock, but be sure to speak with a landscaper to keep your landscaping looking sharp.

While you don’t need to put anything down before mulch, you can apply a pre-emergent herbicide to prevent weed growth. As long as you remove weeds before you spread mulch, you should be in the clear. But a herbicide is something that you can put down before mulch as an extra layer of protection.