New Den farmeri and thyrsiflorum questions

[isdaojon]

Hi everyone,

I have taken a look through the threads mentioning these but haven't found an answer to this question.

I just purchased one of each Den. farmeri and Den. thyrsiflorum. Its early spring here in Vancouver, and so from what I have read I should start watering these now.

However, having the plants in front of me, no new growths are visible yet and the farmeri has a spike developing (which compared to the timing of others seems a bit late for flowering).

Should I start watering these now or wait until I see new growth/flowers start to open?

Thanks in advance for your help!