I grew it this year for the first time. The package indicates not to plant out before last hard frost but can handle light frost. So I waited to start it. I planted it in early May as 2 week old seedlings
or so and it did well. Then it bolts with any heat. So it can't be planted early spring
and can't grow in summer. I will try again in fall. I ate some and gave some away and that is it for this season. The rest bolted and I pulled it. Even my little seedlings
now (in a tray with more lettuce, napa and scallion seedlings
for successive sowings) are bolted. They are teeny and have little yellow flowers
. Broccoli raab was the same thing. Planted it as early as I could and it just was skinny and flowering the whole time and never able to be harvested at all. I pulled it all out and will try in fall. Both are quick growing
but should be more cold tolerant if they are so heat intolerant!