Question

What is the difference between a plug plant, a seedling and a potted plant?

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Answer

Size and stage of development, which determine the price, how much care they need, and how soon they will do anything.

Seeds. Cheapest by a wide margin, greatest choice of varieties, and the most work — requiring sowing, germination conditions, pricking out, growing on and hardening off. Also the slowest.

Seedlings. Very young plants, sold shortly after germination, frequently in strips or trays. They need potting on promptly and growing to a usable size before planting out.

Plug plants. Young plants grown in individual small cells, sold with the root ball intact. Available in a range of sizes — a mini plug is small and cheap and needs several weeks of growing on; a larger plug can go out sooner.

The advantages: far cheaper than potted plants; delivered by post; a wide variety selection; and they remove the difficult germination stage, which is where most failures occur.

The requirements: they arrive small and need immediate attention — potting on into larger pots, frost protection, and somewhere light to grow. Ordering plugs without anywhere to grow them on is the common mistake, and they cannot simply be planted straight into a border in early spring.

Potted plants. Grown to a usable size in containers, ready to plant. Most expensive, immediate effect, and the most reliable — you can see exactly what you are getting.

Sizes are given in litres, and the relationship between size and price is steep: a mature specimen can cost many times a small one of the same variety, and the smaller plant frequently catches up within a few years.

What to check when buying potted:

Roots. Slide the plant out if you can — healthy roots are pale and fill the pot without circling. Tightly spiralled roots indicate a plant left too long in the pot, and it may never establish properly. Teasing them out at planting helps.

Weeds and liverwort on the surface indicate long standing.

Buy small for value, large for impact, and be honest about which you want.

Timing: plugs in spring, potted year-round though autumn planting establishes best, and bare root in winter.

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