How to Know the Perfect Mix for your plants

 

How to know the mix 

 

Potting mixes are not all equal – so here’s how to pick the right blend to help your plants grow their best.

If you've ever wondered why some potted plants thrive while others struggle. The answer often starts at the roots – literally. The quality and composition of potting mix can make all the difference, affecting how well plants absorb water, nutrients and oxygen. Choosing the right blend gives your plants the best chance to flourish from the ground up.

 

Skip the crock

Don’t add large terracotta pieces to the bottom – they steal space from roots and won’t improve drainage

 

What’s in potting mix

Potting mix is specially engineered to give potted plants the best start. Lightweight materials such as coco peat, pine bark and composted plant matter provide structure and retain moisture, while additives like perlite, vermiculite, scoria, pumice or LECA (light weight expanded clay aggregate) keep the mix airy and well draining. In Australia, potting mixes are classified as ‘Premium’ (red tick) or ‘Regular’ (black tick). Premium mixes provide extended nutrient release and superior performance, ideal for long-term container plants. While regular mixes meet essential standards but may require additional fertilisation. Specialist blends are formulated to meet the unique needs of different plants – from the low-phosphorus requirements of native species to the excellent drainage cacti and succulents need. Blends are available for orchids, acid-loving azaleas and rhododendrons, African violets, indoor plants, bonsai and even seed raising. Whatever you’re growing, there’s a mix designed to help it thrive. Most commercial mixes lose their structure after about two years, so repot regularly and add extra drainage with crushed scoria, vermiculite or perlite as needed. The right mix and simple care will keep your pots healthy and productive.

Cover drainage holes

Lay a piece of gauze or shade cloth over large holes to stop soil from falling out

Potting mix can harbour bacteria like Legionella. Wear gloves and a P2 or N95 mask, work in a well-ventilated area, wash your hands thoroughly afterwards and keep your mix slightly moist.

Fix sunken mix

If the potting mix has compacted or sunk, tip the pot on its side, loosen around the root ball with a long knife, add fresh mix to the bottom and slide the plant back in. Repot entirely if needed. 







 

Your custom mixes

Some gardeners prefer to create their own blends, tailoring ingredients to suit specific plants. Here are a few simple recipes for you to try.

General-purpose mix

• 2 parts coco peat or compost

• 1 part perlite

• 1 part vermiculite

• Plus a handful ofslow-release fertiliser.

 

Cacti and succulents

• 2 parts coarse sand

• 1 part pumice or scoria

• 1 part composted bark orvery well-aged compost.

 

Acid-loving plants

• 2 parts sphagnum moss or coco peat

• 1 part pine bark

• 1 part perlite with a low-phosphorus slow-release fertiliser

Click here to read more plant care and soil advice from The Garden Clinic.