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Yes, you need to add topsoil before you hydroseed to ensure the roots can grow deep. You should cultivate and add compost or amendments to your soil before hydroseeding for optimal growth. Without topsoil, your hydroseed might not take root, leading to wasted effort and money down the drain. Soil preparation is key to the success of DIY hydroseeding.

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.

Nonorganic mulch, like river rocks, pebbles, or lava rock, technically lasts the longest. It helps with moisture retention and weed control but doesn’t break down and release nutrients like organic mulch. Wood mulch decomposes slowly, which can help it last longer than leaf or straw mulch, but it won’t provide as many nutrients as quickly as the faster decomposing types.

Yes, it is possible to add too little mulch. Anything less than 1 inch will likely result in too little coverage around your plants, allowing weeds to grow through and minimizing the positive effects that a deeper bed of mulch would have, like maintaining proper soil moisture and insulating the ground.