Container Gardening for Beginners

You don’t need a garden to grow plants. A balcony, a patio, a doorstep or a windowsill becomes a garden with a few well-chosen containers, and you choose the exact potting mix, so you can grow plants your garden soil would never suit.

Containers have one rule you can’t ignore: the University of Illinois Extension points out that because container plants have a very limited volume of soil, watering and feeding are critical. Master that and you can grow flowers, herbs and vegetables in pots. This guide follows the University of Illinois container gardening pages.

Step 1: Choose the right containers

Size. The University of Illinois says larger pots need watering less often than smaller ones with the same plants in the same spot, so if you plan a summer holiday, choose a big pot or a big self-watering pot. Larger plants need more room for roots, and pot size is especially critical for vegetables. A pot much too big for its plants is a problem too: the mix stays wet longer and root rot becomes more likely. Shallow containers suit succulents, which need to dry out between waterings.

Stability. Square pots are the most stable, pots with straight sides are steadier than traditional tapered pots, and small pots can be top-heavy. On exposed balconies, rooftops and decks, look for a base broader than the pot’s height, and strap or anchor tall plants (University of Illinois).

Drainage - non-negotiable. The University of Illinois calls a hole in the bottom of the container critical: it lets water drain so the roots get air, few plants tolerate standing in stagnant water, and plants rarely recover from root rot. If a pot has no hole, drill one, or use it as an outer pot around a plain liner pot (“double potting”) and empty any water that collects in the outer pot. Avoid pots with permanently attached saucers that you cannot empty.

Skip the gravel layer. The University of Illinois calls it a myth that gravel in the bottom of a pot improves drainage: water gathers in the soil just above the gravel until the air spaces are full, so the gravel does little to stop the mix becoming saturated.

Material. The University of Illinois notes that porous materials lose water faster than non-porous ones, that a porous pot can be lined with plastic to slow water loss, and that water in the pores of pottery can freeze and crack it, so protect pottery in winter. Clean used or recycled containers with soapy water and disinfect them with one part chlorine bleach to nine parts water.

Step 2: Use the right potting mix

The University of Illinois says never to use garden soil by itself in containers, however good it looks in the garden: in a pot, drainage and air are severely impeded and plants grow poorly or not at all. Use a container mix, usually made from peat, vermiculite, bark or coir in various recipes.

Succulents, herbs and perennials prefer a well-drained mix with more bark, perlite or sand.
Tropicals and foliage plants prefer a mix with more peat and less coarse material.
If you want to use garden soil, a soil-based mix of one part garden soil, one part peat moss and one part perlite or coarse builder’s sand works (not fine beach or play sand), though it may carry insects, weed seeds and disease. Soil-based mixes are heavier, which helps in windy spots.

Moisten bagged mix slightly before filling the pot, and fill to within about an inch (2-3cm) of the top, leaving room to water (University of Illinois).

Step 3: Choose and arrange plants

Choose plants for your spot, sun or shade. For a mixed pot seen from all sides, the University of Illinois suggests the classic arrangement: tall plants in the centre, shorter mounding plants around them, and trailing plants along the edges. For a pot seen only from the front, put the tall plants at the back and work forward. Set the plants on top of the mix first to try the arrangement, loosen roots that are coiled around the pot, and plant at the same level they grew in their original pots. Then water thoroughly, several times if needed, until water drains from the hole.

Some seasonal ideas from the University of Illinois:

Spring: bulbs, pansies, violas, dianthus, primulas, lobelias and snapdragons, with ivies and other foliage as fillers.
Summer: caladiums, bananas and cannas in large pots for a tropical look; miniature sunflowers, ornamental millets, zinnias and celosia in a sunny spot; Dahlberg daisies, zinnias and dahlias in smaller pots.
Autumn: mums, calendulas, pansies, ornamental kales, diascias, snapdragons, and edibles such as beets and Swiss chard.

For fruit in pots, our strawberry, blueberry and apple guides cover what each needs, and the herbs and fruit section has more container-friendly crops.

Step 4: Water correctly - the make-or-break skill

The University of Illinois says there are no hard and fast rules: how often depends on the time of year, the container’s location, how long it has been planted, the type of container and the plants. So watch your containers regularly.

Feel the soil. If the first inch or so is dry, water (University of Illinois).
Water thoroughly, until it starts to drip from the drainage holes, so the whole root ball is moist and some salts are washed out.
Don’t wait for severe wilting, which affects the plant’s quality and health.
Know your plants. Succulents prefer drier soil and decline if kept too moist; tropicals need more water.
Rewetting a dried-out pot. Soilless mixes shrink from the sides when very dry and water runs straight past them; immerse the pot in a bucket or sink of water until moisture shows at the surface.
Avoid softened water.
Many pots in one place? Drip irrigation makes watering easier, and the University of Illinois notes self-watering containers suit people who can’t check daily.

Going away? Our guide to keeping plants alive on vacation covers containers too.

Step 5: Feed regularly

The University of Illinois notes that frequent watering washes nutrients out of containers, so a regular fertiliser programme is needed through the season:

Slow-release fertiliser mixed into the potting mix or scattered on the surface at the label rate releases a little with each watering.
Liquid fertiliser mixed according to the label and applied about every two weeks, onto moist rather than dry mix, adjusting by how the plants look - or half-strength at every watering.
Analysis: higher nitrogen for foliage plants, lower nitrogen and higher phosphorus for flowering plants and vegetables.

Beginner mistakes to avoid

Pots that are too small - they dry out faster (University of Illinois).
Pots far too big - the mix stays wet and roots can rot.
No drainage hole - wet soil favours root rot.
Garden soil on its own - drainage and air are severely impeded.
Forgetting to feed - watering washes nutrients out.
Watering by a fixed rule - water by the plant’s needs and the feel of the soil.

Frequently asked questions

Can you grow vegetables in containers?

Yes. The University of Illinois notes that adequate pot size is especially critical for vegetables, and that vegetables prefer a lower-nitrogen, higher-phosphorus feed.

Why do my container plants keep dying?

The usual causes are a pot without drainage, garden soil instead of a container mix, watering too little or too much for that plant, and not feeding.

How often should I water container plants?

There is no fixed rule (University of Illinois). Feel the soil and water when the first inch or so is dry, until water drips from the drainage holes.

Do I need special soil for containers?

Yes. Use a container mix, never garden soil on its own (University of Illinois).

Sources

University of Illinois Extension, container gardens: container size, material choices, drainage options, soil, designs, watering, fertilizing. Read 28 October 2026.

Recommended Gear on Amazon

Fabric grow bags (5 gal) - browse current options and reviews on Amazon.
Container potting mix - browse current options and reviews on Amazon.
Slow-release fertilizer - browse current options and reviews on Amazon.

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