Purchasing a water sensor that changes color based on soil moisture.Weighing the container before and after watering to get an idea of weight change as soil dries.Observing signs of dry soil i.e., dry soil is lighter in color than wet soil.Sticking a finger into the soil, and adding water if the soil is dry 1 ¼ to 1 ½ inches deep (to the second knuckle).Suggestions for how to determine whether plants need water include: Check the mix to determine whether water is needed, and avoid under or overwatering plants. Gently firm the soilless mix around the plant, and water the mix lightly. Excess moisture excludes air surrounding fragile stems, causing tissue to rot and eventually die. Many seedlings die because they are transplanted too deeply. When placing seedlings into new pots, do not plant them any deeper than they were planted in the container used for germination. Hold the seedling by its leaves instead of the stem, which can be easily injured. Using a pencil or a stick, carefully remove seedlings from the sowing container while trying not to damage the roots. You can do this by rotating a pencil or short pointed stick (dibble) to make a cone-shaped hole. Then, make a hole (dibble), which is large enough to contain the seedling's root system without crowding. Level the medium to about 2 inches from the top of the container. You can use the same sterile soilless mix or seed-starting mix that you used during germination to fill new containers, because its uniformity encourages new roots to grow into the larger space. To transplant seedlings, fill individual containers with a soilless potting mix.
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