Climbing plants want to go up. Pole beans wind three metres high in a single season, cucumbers hang cleanly in the air instead of in the mud, and peas grab at every hold they can find with their fine tendrils. Only: you have to build that hold. And you have to build it before the plant needs it, not once it is already lying on the ground.
The good news: a trellis is not a piece of furniture. You need no tool you never otherwise touch, and no 40-euro ready-made kit from the hardware store. A few poles, some twine, a spade. Here you get the sizes that actually carry weight, worked out separately for beans, cucumbers and peas, because these three climb in completely different ways.
Why whatever can climb should grow upward
A square metre of bed holds a few bush beans at ground level. The same square metre, built upward, holds many times that, because the harvest hangs on a wall of leaves instead of on a surface. That is the real reason for any trellis: it turns area into volume.
Health comes on top of that. Whatever hangs in the air dries off quickly after rain. Cucumbers on a trellis get powdery mildew less often, beans do not rot from below, peas stay clean and let you pick standing up instead of on your knees. And crooked cucumbers that had to grow around a stone on the ground simply do not happen on a trellis. They hang straight down, pulled by their own weight.
The right moment: build before you sow
Build the frame in CW 14 to 18, so from early April to early May. In this window the soil has dried out and is walkable, but the warmth-loving climbers are not yet in the bed. You can work with the spade, drive poles in deep and line everything up without having to spare any young roots.
Anyone who reverses the order and plants the bed first knows the result: you ram the pole in next to the plant and hit the taproot. Or you no longer dare to strike properly, and the frame wobbles all summer. First the frame, then the plant. Always.
Material and tools
- PolesHazel, bamboo or spruce battens. Beans need 2 to 2.5 m, cucumbers and peas manage with 1.8 to 2 m. Diameter 3 to 5 cm; any thicker and a bean can no longer wrap around it.
- TwineNatural jute or sisal twine for annual climbers, because it can go on the compost with them. Wire or coir rope if the frame is meant to stand for several years.
- Trellis or netFor cucumbers a net with a 10 to 15 cm mesh, so the fruit can hang through. For peas fine brushwood or a net with tight mesh.
- ToolsA spade, a rubber mallet or a heavy block of wood for driving poles in, secateurs, a folding rule. Not one of these builds needs more than that.
A word on the wood: hazel poles are the classic, because they are light, tough and free if you coppice a hazel shrub in March. Bamboo is smooth, which makes winding harder; climbers prefer rough poles. Spruce or larch battens from the hardware store last three to five years if you store them dry over winter.
Building a bean pole and bean teepee
Pole beans (Phaseolus vulgaris) climb by winding around their support, always counterclockwise, to the left seen from below. They do not grip with tendrils, they wrap. That is why they need a continuous, not-too-thick pole they can screw themselves up. A net is the second-best solution for beans; a pole is the first.
The most classic and most stable form is the teepee, because a cone braces itself against the wind.
Mark the circle
Mark out a circle 1 to 1.2 m across. Smaller and it gets too cramped inside to harvest, larger and the teepee loses stability.Set the poles
Space 5 to 7 poles evenly around the circle. Drive each one 30 to 40 cm deep, angled slightly inward. A firm footing decides the whole summer; do not skimp here.Tie the top
Bring the poles together at the top and tie them firmly with twine or wire. Wrap several times and knot generously; this single binding later carries the whole load.Leave a doorway
Leave one of the gaps a little wider. Through this entrance you will later harvest the inside comfortably, without wading through leaves.Sow
From mid-May · CW 20 you place 4 to 6 beans at the foot of each pole, 3 to 4 cm deep. After they come up, keep the two strongest plants per pole.
For long rows an A-frame is more practical than many teepees: two rows of poles about 40 cm apart, leaned against each other and joined at the top by a horizontal ridge pole to which everything is tied. Set the poles 25 to 30 cm apart. That gives a load-bearing wall of beans you can harvest from both sides.
Building a cucumber trellis
Outdoor cucumbers (Cucumis sativus) climb with tendrils, small gripping threads that feel for anything thin enough. They cannot grasp a thick bean pole. They need a grid, a net or taut strings for the tendrils to catch on. And they want it vertical, because a hanging cucumber grows the straightest.
Stand the frame
Set two sturdy posts 1.5 to 2 m apart, each 40 cm deep. Join them at the top, at a height of 1.8 to 2 m, with a horizontal cross bar. That is your load-bearing frame.Stretch the net
Stretch a trellis or net with a 10 to 15 cm mesh tightly into the frame. Tight matters; a sagging net swings in the wind and tears off tendrils.Or run strings
No net to hand? Stretch vertical jute strings every 20 to 25 cm from the cross bar down to a ground anchor. Each string carries one plant.Set the plants
From mid-May · CW 20 you set the young plants every 30 cm at the foot of the trellis. The tendrils find their own way; at the start you help with a loose tie.Guide them
Guide the main shoot loosely upward for the first weeks and tie it softly every 30 cm. Strips of old T-shirts do not cut into the stem.
Building a pea frame
Peas (Pisum sativum) are the daintiest climbers of the three. They grip with thin tendrils and only get up fine material: brushwood, chicken wire, a tight-meshed net or stretched wire. A smooth pole slips right through their tendril. In return they are hardy and may go in early, often already in March.
The prettiest and cheapest solution is ancient: brushwood, the twiggy prunings gardeners call pea sticks. When you cut back woody plants in winter, keep the branched twigs.
Push in the sticks
Push branched twigs 60 cm to 1.5 m tall into the ground every 15 to 20 cm along the pea row, at least 20 cm deep. The row becomes a small hedge the peas grow into.Height by variety
Low varieties need 60 to 80 cm, tall marrowfat and sugar peas want 1.5 to 2 m. Read the variety note and build a little too high rather than too low.Or stretch a net
Instead of brushwood you can stretch a fine-meshed net between two posts. Mesh 5 to 10 cm, so the delicate tendrils find a hold.Plan a double row
If you sow in a double row 20 cm apart, you stand the frame down the middle. Both rows grow inward from the outside and support each other.
Pea tendrils are precision mechanics. They feel into the air, find a hold a few millimetres thick and wind around it within hours. That is exactly why a thick pole fails completely with peas: there is nothing to wrap around. Give them many thin holds close together and they climb on their own. You almost never have to tie peas in.
Stability: the point where most builds fail
Almost every failed trellis fails not on height and not on material, but on its footing. A pole stuck only 10 cm into the soil holds a young plant; it does not hold three metres of beans in the August wind. The rule of thumb: at least a fifth of the total height sits in the ground. For a 2.5 m bean pole that is 40 to 50 cm.
- Set it deepThe taller the frame, the deeper the foot. 30 to 40 cm is the minimum for climbers, not the exception.
- Build trianglesA single vertical post tips over, a triangle stands. Teepee and A-frame are stable because they brace themselves. A free-standing single post needs a diagonal strut.
- Tie the top firmlyThe top binding carries everything. Wrap the twine several times, knot generously and check it once more in high summer.
- Think about windDo not put tall frames out in the open in the main wind direction. A house wall, a fence or a lower neighbouring crop at their back takes a lot of pressure off.
Common mistakes and how to avoid them
The most common mistake is the wrong support for the plant: a thick pole for the pea, a net for the bean. Remember the split. Winders want poles, tendril-grabbers want grids. The second mistake is building too late and injuring roots in the process. The third is a footing that is too shallow. The fourth, surprisingly often: sowing too densely. Even the best trellis does not help if ten beans jostle around one pole and shade each other out. Two strong plants per pole are worth more than six weak ones.
And one last, quiet mistake: wanting to perfect the trellis in the first year. The garden is a multi-year project. Your first bean teepee may come out a little crooked, the next one stands. Build it, harvest from it, and by next April you already know what you will do better.
Read on
If vertical gardening has caught you, two paths lead further. For permanent, woody climbers on wall and fence, take a look at greening a screen with climbing plants. And if you want to grow fruit against a wall to save space, you will find the technique under training an espalier for apple and pear. Both work with the same core idea: turning area into height.
Häufige Fragen
When do I build the trellis for beans and cucumbers?
Build the frame in CW 14 to 18, so early April to early May, before you sow or plant. That way the soil is walkable and you injure no roots when you drive the poles in. The frost-tender beans and cucumbers themselves only go into the bed after the Ice Saints, from mid-May · CW 20, but the frame may happily stand there empty. Peas are hardier; you can put up their support already for direct sowing in March.
How tall does a support for pole beans need to be?
Pole beans grow 2 to 3 m tall depending on variety, so you plan a height of 2 to 2.5 m above the ground plus 30 to 40 cm that sit in the soil. If the frame is too low, the plant grows off the top into the air, tips over and shades itself. Bush beans, by contrast, need no support at all; they stay low on their own.
What kind of support suits peas?
Peas climb with fine tendrils and need thin material: brushwood from the winter prunings, a tight-meshed net with 5 to 10 cm mesh, or chicken wire. A smooth, thick pole does not work because the tendril finds no hold. Push the brushwood in every 15 to 20 cm along the row, 60 cm to 2 m tall depending on variety. You almost never have to tie peas in; they grab on their own.
Why won't my bean climb up the pole?
Usually the pole is too thick. Pole beans wind around their support and manage a diameter of up to about 5 cm; if the pole is thicker, the young plant slips off. Help in the first days with a loose tie and lead the shoot counterclockwise around the pole. Also check that it really is a pole bean; bush beans do not climb at all.
Can I build a trellis from material from the garden?
Yes, and that is often the best solution. Hazel poles, branched brushwood from the winter prunings and jute or sisal twine are enough for a whole season and may go on the compost afterwards. Natural twine on annual climbers saves you the fiddly untying in autumn; you cut everything down together. Only if the frame is meant to stand for several years do you reach for wire, metal posts or treated timber.
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