A 1.75-metre clearance decides what you will grow
A growing bed at 700 mm, an LED frame at 2.55 m. What is left between them is not a layout detail but a constraint on the whole crop range.
The internal height of a 40-foot high-cube container is 2.70 metres. That seems enough for almost anything. Then the arithmetic starts, and it shortens the crop list faster than any agronomic argument.
Where the height goes
The growing bed is the space between two rails about 700 millimetres above the floor. There is no point in placing anything below bed level: that is where the solution supply and drain run, and there must be room for maintenance.
Above, at 2.55 metres, hangs the LED frame. It cannot be lowered: the distance from the light source to the leaf determines both how even the light is and the risk of scorching.
Between the bed and the frame there are about 1.75 metres. That is the working clearance, all the height available to the plant.
What follows from this
1.75 metres is a comfortable height for one tier of tall crops: tomato, sweet pepper, chilli. The usable bed area in such a container is about 17.6 square metres.
It is not enough for multi-tier growing. Splitting 1.75 metres into two tiers leaves each tier less than 90 centimetres once you account for the rack thickness and a second lighting frame. That only suits low-growing crops. So microgreens and strawberries are grown in several tiers, and only they are. With racks, the usable area for microgreens reaches 40 square metres in the same container, more than twice the single-tier layout.
All other crops grow in one tier. Not because an agronomist decided so, but because the container geometry did.
Why you should know this before signing
The difference between 17.6 and 40 square metres of usable area is a difference in revenue per container of more than two times. Planning the crop range without this number means planning the wrong business.
The typical mistake at the start looks like this: the investment model is built on the area of multi-tier microgreens, while the client wants to grow tomatoes. The model adds up. The site does not.
What can be done about it
Not much. The container height cannot change: it is a standard product, and that is the whole point of the form factor. Lowering the bed below 700 millimetres means losing access to the hydraulics. Raising the frame above 2.55 metres is impossible: that is the ceiling.
There are two real options. The first is to accept the constraint and choose crops to fit the clearance. The six growing modules in the farm are each designed for their own crop, and microgreens and strawberries are in them for a reason. The second is to move from containers to a conventional greenhouse, where height is set by the structure rather than by an ISO standard.
The choice between these options is made in the first conversation, not during installation. That is why the system runs the layout calculation before the containers are ordered and prints concrete usable-area figures for each crop. The decision is then made on numbers, not on an impression from photos of someone else’s vertical farm.