  Theoretical constructs of logical gates implemented with plant roots are
morphological computing asynchronous devices. Values of Boolean variables are
represented by plant roots. A presence of a plant root at a given site
symbolises the logical {\sc True}, an absence the logical {\sc False}. Logical
functions are calculated via interaction between roots. Two types of
two-inputs-two-outputs gates are proposed: a gate $\langle x, y \rangle
\rightarrow \langle xy, x+y \rangle$ where root apexes are guided by gravity
and a gate $\langle x, y \rangle \rightarrow \langle \overline{x}y, x \rangle$
where root apexes are guided by humidity. We propose a design of binary
half-adder based on the gates.

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