When space is tight, the goal is to stack crops that want different things from the same patch of soil: something tall and something low, a fast crop and a slow one, a leaf and a root. Good companions, by definition, are plants that don't fight over the same light, water and nutrients — so companion planting and small-space growing are really the same skill.
The square-foot method is the natural home for this. Grid a raised bed into squares and give each one a crop spaced to suit it: a square of lettuce in the cool shade of a taller neighbour, carrots beside onions, radishes filling a gap that'll be empty again in a month. A tall raised bed brings it all up to a comfortable height, too — kinder on the back, and easier to keep tucked and tidy.
Pairings that earn their inch
Grow climbers up and leaves below: beans or a cordon tomato going skywards, with lettuce or herbs at their feet. Pair a quick crop with a slow one — radishes between carrot rows are pulled long before the carrots need the space. And tuck a few flowers into the corners (marigolds, nasturtiums) to pull pests off such closely-packed plants.
Grow these alongside
Uses the cool shade of tomatoes or beans without needing its own patch of sun.
Up and harvested in a month — perfect gap-fillers between carrots or parsnips.
Alternating rows mask each other's scent and pack two crops into one space.
Chives, parsley and basil tuck into corners and earn their keep in the kitchen.
Grow vertically for a big harvest from a tiny footprint, with room beneath for leaves.
Flowers worth tucking in
The blooms that pull pests away and bring in the bees — beauty that earns its keep.
Compact pest-control that fits any corner.
Trail over the edge of a raised bed or pot, luring aphids away.
Common questions
Can you companion plant in containers and pots?
Absolutely — just keep partners that like the same watering and feeding together, and don't overcrowd. A big pot of tomatoes with basil and a trailing nasturtium over the edge is a classic small-space combination that works beautifully.
How do I fit more into a small raised bed?
Grow upwards as well as along (climbing beans, cordon tomatoes), pair quick crops with slow ones so nothing sits idle, and use the square-foot method to give each crop just the space it needs. Companion planting is what makes this dense growing work without the plants fighting.
Want the whole picture?
The complete companion planting guide →