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!