topping a sativa?

I have a silver kush which is 70% sativa and 30% indica. Its about 4 weeks old and I can already see it's a sativa dom. The nodes are spaced far apart and its growing taller than my blue dream's and gigabud. I want to keep all about the same height. Though I am going to hang a hps bulb vertically. I would still like for the plant to stay approx. the same height. My question is, can I safely top a sativa? If I do, do I have to take any precautions? Thanks!

You'll be fine, people top sativas all the time, they often would grow to tall for most indoor growers otherwise.

I don't think any special precautions need to be taken, just notice if you stress the plant after the prune, or not, you'll be surprised and how much you can manipulate any strain to grow how you want.

How about pinching rather than topping? much less stress and Will stop a branches growth for a couple days. you can do it pretty much whenever a branch starts shooting up. They Will stretch twice as much when flowered anyway when you can't top. pinching has Been known to slow a sativas stretch without too much stress. ymmv

Read Uncle Bens topping technique thread. I did this to a plant I intended to keep as a mother. Changed my mind & now have it on flower & you should see this plant, 4 big healthy main colas. I'm going to continue to do this to all of my girls
It also should help with height uniformity I'd imagine. Although a reasonably sized plant, it's a lot shorter than it's sister that wasn't topped.

You can also use products to stop stretching like the late Bush Master. Supposed to reduce flowering time and increase yields too. Bush Master is off the market now because of a mislabeling of the chemicals used in it being printed on the side but there are similar products available. Hydro stores carry them.

imo top and lst the fuck out of it, watch out for the flower stretch too, some sativas need to be heavily trained to keep manageable

Do it NOW! , remember it takes a week or so for the plant to re-coup form topping, ect