A four-level 30 square metres large farming technology container with 900 plants is lit by LED lights outside a store of IKEA, the world's biggest furniture group in Kaarst near Duesseldorf, Germany, April 3, 2019. IKEA tests growing the crops fully automated without soil using organic nutrients produced by recycling organic waste from the nearby IKEA restaurant taking five weeks from sowing to harvest.

Jesper Brodin, chief executive of Ingka Group, which owns most stores of the world's biggest furniture group IKEA, poses in front of an IKEA store in Kaarst near Duesseldorf, Germany, April 3, 2019. REUTERS/Wolfgang Rattay

A customer looks at a Billy bookcase, one of the top sellers of IKEA, the world's biggest furniture group, in Kaarst near Duesseldorf, Germany, April 3, 2019.

Jesper Brodin, chief executive of Ingka Group, which owns most stores of the world's biggest furniture group IKEA, poses in front of an IKEA store in Kaarst near Duesseldorf, Germany, April 3, 2019.

A red lettuce is pictured inside a four-level 30 square metres large farming technology container with 900 plants lit by LED lights outside a store of IKEA, the world's biggest furniture group, in Kaarst near Duesseldorf, Germany, April 3, 2019. IKEA tests growing the crops fully automated without soil using organic nutrients produced by recycling organic waste from the nearby IKEA restaurant taking five weeks from sowing to harvest.

An employee of IKEA, holds a "fair and equal" placard during the start of the "One Home, One Planet" campaign of the world's biggest furniture group at a store in Kaarst near Duesseldorf, Germany, April 3, 2019. REUTERS/Wolfgang Rattay - RC125B336570

A sign reads "natural - sustainable" at a store of the world's biggest furniture group IKEA in Kaarst near Duesseldorf, Germany, April 3, 2019.

Giveaway pencils are stacked at a store of IKEA, the world's biggest furniture group, in Kaarst near Duesseldorf, Germany, April 3, 2019.

A basil plant and a red lettuce grown without soil, using nutrients and water while LED-lights give it the light it needs to grow, is pictured outside a 30 square meters farming technology container that IKEA, the world's biggest furniture group, tests at an IKEA store in Kaarst near Duesseldorf, Germany, April 3, 2019. The crops grow on four fully automated levels using organic nutrients produced by recycling organic waste taking five weeks from sowing to harvest.

A four-level 30 square metres large farming technology container with 900 plants is lit by LED lights outside a store of IKEA, the world's biggest furniture group, in Kaarst near Duesseldorf, Germany, April 3, 2019. IKEA tests growing the crops fully automated without soil using organic nutrients produced by recycling organic waste from the nearby IKEA restaurant taking five weeks from sowing to harvest.

Jesper Brodin, chief executive of Ingka Group, which owns most stores of the world's biggest furniture group IKEA, poses for a picture at an IKEA store in Kaarst near Duesseldorf, Germany, April 3, 2019.

Pia Heidenmark, chief sustainability manager of Ingka Group, which owns most stores of the world's biggest furniture group IKEA, is pictured at an IKEA store in Kaarst near Duesseldorf, Germany, April 3, 2019.

An employee of IKEA hangs up a sign reading "natural - sustainable" at a store of the world's biggest furniture group in Kaarst near Duesseldorf, Germany, April 3, 2019.

Jesper Brodin, chief executive of Ingka Group, which owns most stores of the world's biggest furniture group IKEA, poses for a picture at an IKEA store in Kaarst near Duesseldorf, Germany, April 3, 2019.

Picture shows a show room of an IKEA store, the world's biggest furniture group, in Kaarst near Duesseldorf, Germany, April 3, 2019.

Jesper Brodin, chief executive of Ingka Group, which owns most stores of the world's biggest furniture group IKEA, poses in front of an IKEA store in Kaarst near Duesseldorf, Germany, April 3, 2019.

A four-level 30 square metres large farming technology container with 900 plants is lit by LED lights outside a store of IKEA, the world's biggest furniture group, in Kaarst near Duesseldorf, Germany, April 3, 2019. IKEA tests growing the crops fully automated without soil using organic nutrients produced by recycling organic waste from the nearby IKEA restaurant taking five weeks from sowing to harvest.

Pia Heidenmark, chief sustainability manager of Ingka Group, which owns most stores of the world's biggest furniture group IKEA, is pictured at an IKEA store in Kaarst near Duesseldorf, Germany, April 3, 2019.

Jesper Brodin, chief executive of Ingka Group, which owns most stores of the world's biggest furniture group IKEA, is pictured during an interview in Kaarst near Duesseldorf, Germany, April 3, 2019. REUTERS/Wolfgang Rattay - RC1E2DE19300

Image used for illustrative purpose. Customers walk by a placard reading "Act Now" as they leave the IKEA store in Kaarst near Duesseldorf, Germany, April 3, 2019.

A sign reads "natural - sustainable" at a store of the world's biggest furniture group IKEA in Kaarst near Duesseldorf, Germany, April 3, 2019.

A red lettuce grown without soil, using nutrients and water while LED-lights give it the light it needs to grow, is pictured outside a 30 square meters farming technology container that IKEA, the world's biggest furniture group tests at an IKEA store in Kaarst near Duesseldorf, Germany, April 3, 2019. The crops grow on four fully automated levels using organic nutrients produced by recycling organic waste taking five weeks from sowing to harvest.

A four-level 30 square metres large farming technology container with 900 plants is lit by LED lights outside a store of IKEA, the world's biggest furniture group, in Kaarst near Duesseldorf, Germany, April 3, 2019. IKEA tests growing the crops fully automated without soil using organic nutrients produced by recycling organic waste from the nearby IKEA restaurant taking five weeks from sowing to harvest.

Customers walk through an IKEA store, the world's biggest furniture group, in Kaarst near Duesseldorf, Germany, April 3, 2019.

A four-level 30 square metres large farming technology container with 900 plants is lit by LED lights outside a store of IKEA, the world's biggest furniture group in Kaarst near Duesseldorf, Germany, April 3, 2019. IKEA tests growing the crops fully automated without soil using organic nutrients produced by recycling organic waste from the nearby IKEA restaurant taking five weeks from sowing to harvest.

An employee of IKEA hangs up a sign reading "natural - sustainable" at a store of the world's biggest furniture group in Kaarst near Duesseldorf, Germany, April 3, 2019.