Modular planting box system including liquid level and insert

Claim 1

An improved planting box assembly being formed of a plurality of individual planting boxes each being stacked upon one another, said boxes are formed by a frame having a polygonal cross-section with vertical walls, vertical ribs and vertical channels at said walls; said ribs and channels are formed of a complementary cross-section; said channels being formed of a pair of individual planting boxes stacked one upon another to define vertical slide guides for ribs of another planting box, enabling lateral connection of respective planting boxes of identical shape; supporting means arranged in each of the said channels defining structure to support said ribs, said improvement comprising: disposing a planting box vertically in an offset position with respect to a first planting box, by half of the height of the other planting boxes; each individual planting box having a lower edge portion formed at each vertical wall, a lower one of a given pair of planting boxes having a bottom wall connected with the lower edge portion; a pot-like insert having an outer edge portion at its upper end, disposed on the lower edge portion of an upper one of said pair of planting boxes, said insert having an overall height which is at least equal to the interior height of the respective planting boxes; a bottom portion of the pot-like insert being disposed to be spaced from a bottom of the lower one of said pair of planting boxes; a plurality of small openings and recess means of a reverse cup-like shape formed in said insert adapted to retain a solid nutrient preparation therein; and a vertical tube formed at the inner side of one side wall of said pot-like insert and an extension tube extending over the whole height of a plurality of planting boxes stacked one upon another, for insertion into the vertical tube to thereby receive a displaceably arranged float body connected by a vertical rod and an indicator element disposed at an upper end of the vertical rod, the indicator element being surrounded by a sleeve-like head of transparent material fitted over an upper end of the extension tube.