Abstract
Interactive effect of four planting dates viz. 1-September, 1-October, 1-November and 1-December with five promising strawberry cultivars viz. Sweet Charlie, Festival, Camarosa, FA 008 and BARI strawberry-1 were studied under subtropical climatic conditions of Bangladesh during the period of winter 2009-10 and 2010-11. Among the interactions, the cultivar Camarosa planted on 1 September exhibited the tallest plants (35.67 cm) followed by Festival (30.67 cm) planted on same date while plants of BARI Strawberry-1 had the shortest plants (14.67 cm) planted on 1 December. The highest number of leaves plant-1 (55.33) was obtained in Festival followed by Camarosa (52.33) when planted on 1 September, while plants of FA 008 produced lowest (23.00) leaves plant-1 when planted on 1 December. Plants of Festival planted on 1 September exhibited maximum mortality percent (21.33%) followed by Camarosa (20.00%) and Sweet Charlie (19.67%) planted on same date. On the other hand, plants of BARI Strawberry-1 planted on 1 December exhibited only 4% of plant mortality. Among the cultivar studied, Sweet Charlie planted on 1 October produced the highest yield per hectare (16.77 ton), while BARI Strawberry-1 when planted on 01 December planting produced the lowest per hectare (2.247 ton). Total soluble solids (TSS) and ascorbic acid content of fruits were highly influenced by interaction effect of date of planting and cultivar and found that regardless of cultivar, fruits of early planted plants contained more TSS and ascorbic acid than late planted plants. Key words: Strawberry, sub-tropical region, planting date, total soluble solids, ascorbic acid.  
Highlights
There is substantial evidence that genetic factors control the growth, yield and fruit quality in strawberry (AvigdoriAvidov, 1986), but the cultivars are significantly influenced by the weather conditions, and planting time (Zheng et al, 2009)
Plant height of different strawberry cultivars was significantly influenced by interaction effect of planting time and cultivars of strawberry (Table 1) and found that, plants of Camarosa and Festival planted on 01
September (35.67) had the maximum plant followed by Camarosa planted on 01 October (30.67 cm), while minimum plant height was recorded from BARI
Summary
There is substantial evidence that genetic factors control the growth, yield and fruit quality in strawberry (AvigdoriAvidov, 1986), but the cultivars are significantly influenced by the weather conditions, and planting time (Zheng et al, 2009). Planting time has direct effect on day and night temperature, day light intensity and photoperiod, which affect the floral induction, fruit size, quality and production. There are several reports available in the literature indicating that strawberry can be planted on different times of the year depending on the variety, location and climates (Sharma and Sharma, 2004). Planting time of strawberry is important for partitioning the assimilates, which directly influence the growth and yield of strawberry. Rahman et al (2014) observed that in strawberry, delayed planting significantly reduced the yield.
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