permaculture trench building with logs of wood with grass side

permaculture trench building logs wood grass side construction agriculture backyard biodegradation biomass bois botany compost compostable composting covered dirt dacopy chiquetacopy farm fertile fertility forest garden gardening ground growing growth horticulture hugel bed hugelkultur jardin jardiner land longterm lacopy gume organic plant potager preparing printemps rotten shredded soil sol spring terre vegetable log