Any ideas on an expected date for harvesting?
Roughly ten weeks after the first sign of leaves above soil level
I can't say I have heard of Orla so I am assuming it is a 1st Early
So back tracking on the information given;
You sowed them 13/2 which is week 7
Say three weeks to emerge; = week 10
Therefore they should be ready about week 20 = Mid May.
Thats the best I can do I am afraid different varieties can vary by a few weeks.
Hope that helps!