I love Thalictrum. It is a fantastic herbaceous perennial, tall with delicate fluffy flowers which seem to float on the breeze.
The height of Thalictrum depends on the variety but generally it is a tall plant, growing between 1.2 -2.5M. It is one of the best and easiest plants to grow and gives a great height to the borders. Thalictrum, common name Meadow Rue, flowers in the summer and has the additional benefit of long-lasting flowers with attractive seed heads. It is herbaceous, which means it dies back over the autumn leaving bare earth in the winter, from which fresh new growth appears in the spring.
Thalictrum's preferred growing conditions are soil which is on the moist side, although well drained. That said Thalictrum will grow reasonably well in most borders in terms of position and soil types, and tolerates partial shade. Although it is tall, I have never bothered to stake it and despite some gales and poor summer weather it has remained (mostly) upright. One advantage of not staking Thalictrum is that with the breeze the whole plant moves around, and it seems not to mind floating around freely without being staked. If your garden is prone to blustery winds rather than stake Thalictrum, which spoils its lovely ethereal shape, plant around it to give it protection and support, such as with Delphinium or a contrasting shrub.