Have canna red king humbert " " the president cana 'grande" pindo seedlings in 3 gallon pots meyer lemon cuttings Yellow flowering opuntia cactus strawberry plants

More than likely it's scale and that's honeydew dripping from it. I use a concentrate from expert gardener that works great .

It depends on what kind of yucca it is. The more tropical species, such as Y. gloriosa can be fairly easy to do that with. The hard-bitten desert species are more difficult--it's rumored that it's impossible with Y. brevifolia. If you want to try, cut off about 1/2 to 2/3 of the green leaves; take a sharp saw and make a fresh, clean cut through the broken end, and immediately dust it with sulfur powder (and/or rooting hormone powder); let it dry for 2-3 days in the shade; then put 2-3 inches of the cut end into moist pumice, or a mixture of sand and perlite, holding up the stem with stakes. Keep the pumice moist, but not soggy, and, hopefully, the leaves will suddenly plump up, and the tip start to grow in a month or two. Wait another couple of months, then repot into a cactus mix or other fast draining potting mix. Good luck, Kevin : )

Primary growth (extension/ growing longer) takes place immediately proximal to (behind) the very end of every branch and stem in an area called the apical meristem or apex. Once the branch or stem apex is removed by way of pruning/ injury/ herbivory, that branch/ stem is no longer capable of elongation. In the rooted cutting below, you can see (by the stub) the branch apex has been removed, so it can no longer elongate; however, removing the branch/ stem apex stimulates growth from latent buds in the axils (crotches) of leaves or immediately above the scars where leaves have fallen off. The new growth in the axils of both of these leaves has produced new branches, complete with their own apex, making them fully capable of elongation. So, while the branch pruned originally cannot elongate, one of the new branches can 'take its place' and made to appear as though it's the new branch leader. If I pruned the short. dead stub back flush to the new branch, it is unlikely you could ever tell the main branch was ever pruned. Al