Muscle spasms, which can affect any part of the body, are an involuntary contraction in the muscle tissue. Depending on the muscle's size and location, it might be sharp and painful or nearly imperceptible.
Think of it this way - a seed starting mix kickstarts the seed into accelerated growth mode. How to Choose the Best Seed Starting Mix Lightweight and Hydrated Mix. For your seed to grow into a healthy seedling, the best seeding mix is a lightweight and well-drained soil that has a balanced mixture of organic materials like vermiculite or perlite. The soil mix should also have excellent aeration and water retention properties so that the seed's root can push through and have room to grow.
An ideal growing medium for heuchera seeds is an equal amount of a good seed starter mix and vermiculite or perlite. The perlite or vermiculite makes the soil mix lighter and more permeable and is really necessary if you want sturdy, healthy seedlings. Moisten the soil mix until it is damp but not wet.