Corn (Zea mays L.) is one of the most significant cereal crops worldwide. Babycorn is currently farmed in Kenya mostly for export markets, with a very limited quantity being grown for local use, mostly in urban areas. Insufficient evidence-based research prevents baby corn, which is a relatively new crop, from being transplanted at a large scale. Two experimental studies were conducted to establish the performance of transplanted baby corn under varying growth conditions in Meru County. The first experiment was to determine the best baby corn transplanting stage under farmer conditions (Field and Greenhouse conditions). The experiment was setup in a split plot randomized complete block design (RCBD) with three replications. Two baby corn varieties (PAN 14 and Thai Gold) were grown under 4 transplanting stages (0,200, 300 and 400 Growing degree days (GDD)) under green house and field conditions. To determine interaction between different treatments (plastic mulch colours and phased transplanting stages) on the performance of baby corn plant varieties a field experiment was setup in a split-split plot RCBD design with three replications. PAN 14 and Thai Gold were transplanted at four transplanting stages (0,200, 300 and 400 GDD) under four different plastic mulch colour (yellow, clear, black and control). Data was collected on growth (maturity GDD and flowering height) and yield parameters (cob length, diameter and weight). Collected data were analyzed using SAS 2007, and means were separated by LSD test (P≤0.05). There were statistically significant interactions (P≤0.05) observed between the transplanting stage and baby corn varieties and mulch colour on maturity GDD, flowering height under various growing conditions. There were no significant interactions (P>0.05) among plastic mulch colour, transplanting stages, and varieties on cob length, cob diameter, and cob weight. However, significant interactions were found between plastic mulch colour and baby corn varieties on cob length and cob weight. Transplanting baby corn at 200 GDD resulted in significantly(P≤0.05) higher growth and yield performance. Additionally, PAN 14 variety exhibited greater resilience to dynamic growth conditions compared to Thai Gold, suggesting its suitability for field conditions. Black plastic mulches showed significantly (P≤0.05) higher soil temperatures, followed by transparent films, yellow films and non-mulched. Transparent plastic mulches showed the best yield and vegetative growth for both varieties but could not effectively control weeds. Black plastic mulches produced significantly (P≤0.05) higher yield and vegetative performance than non-mulched, but were lower than the transparent film performance. Additionally, black plastic mulches showed better performance. The temperature differences between the mulch treatments were attributed to variations in solar energy reflection, absorption, and transmission. The choice of plastic mulch colour, transplanting stages, and varieties had significant effects(P≤0.05) on factors such as maturity height, maturity days, and soil GDD. Yellow plastic mulch had the longest maturity period, while the control had the longest maturity period in all transplanting stages. The study recommends that transplanting baby corn at 200 GDD under black mulch leads to the best growth performance, while transplanting PAN 14 baby corn variety at 200 GDD under transparent mulch was the best in cob yields in both green house and field conditions.