There are many reasons we re-pot plants, but primarily it is because the plant has outgrown its pot. Plants that are in a pot that is too small will not receive the water or nutrients they need to continue growing.
Another reason is that potting soil will not last forever in any pot. Over time, it will become exhausted and lose its valuable nutrients and water-holding capacity. So, when you are re-potting plants that may have been in the same pot for years, it is time to completely refresh the mix.
Empty the pot completely of soil, throw it in the garden bed and mix it through with the existing soil. It is a good idea to give the empty pot a wash out; this will make sure any bugs or diseases are cleaned out before you use your new potting soil.
The type of potting soil to use is governed by the type of plant. There are now specially blended mixes to suit vegetables, herbs, flowers, fruits etc. For general plants and flowers, look for a mix that has a long-term fertilizer added; it will usually state on the bag in months the period of time the fertilizer will last before you need to replenish it one of the biggest downfalls of container gardening is retaining the water in pots, as they dry out quickly.
In fact, it’s very hard to tell which is perfect potting soil but you should choose an organic potting soil that has an added moisture retention product like Espoma Organic Potting Mix. Espoma AP8 Organic Potting Mix works for all indoor and outdoor containers, also enhanced with Myco-Tone water saving formula. It will also help to stop the pot drying out too quickly. Potting Mix can be added to existing pots that have become too dry by scratching it through the surface of the soil.
Miracle-Gro Moisture Control Potting Mix is also a good choice, it Protects against over- or under-watering and absorbs up to 33% more water than basic potting soil vs potting soil that does not contain sphagnum peat moss, coir and wetting agent. So, your plants can remain hydrated, good for outdoor and indoor container plants
Grouping pots together will minimize exposure to the sun and keep them from drying out. It also makes watering easier when they are all in one area. It is never a good idea to leave any plants that have been lifted out of the pot for too long before you re-plant, as when you do the soil will dry them out very quickly. If this cannot be avoided, have a wet sack or an old sheet handy. Cover the plant’s root system and move them in to a shady spot until you are ready.