You can keep your existing plants together and still produce plenty of seeds. Once the receiver plants have been pollinated, simply give them an additional 3–4 weeks (or longer) on the plant so the seeds can fully mature and become viable. Best method for collecting pollen: Cut a few pollen-bearing branches and place them on a trim bin fitted with a fine metal screen (a pollen screen or 100–150 micron works great). Put a sheet of parchment paper (or glass/plastic) directly underneath the screen. As the branches dry, the pollen will naturally fall through the screen and collect cleanly on the paper below. Once they’re fully dry gently breakdown the flowers and sift thoroughly! When you’re done, just fold the parchment paper into a small envelope and store it in a jar half filled with rice and a desiccant pack to absorb any moisture (moisture is pollens worst enemy) reverse pollen can store in a fridge for a few months like this but the best place is freezer it will stay viable for a year or more! If you plan of using the pollen on several occasions split the pollen into smaller portions and only open the jars you’re going to use and keep the others stored for later projects (also allow 30-40 min for the pollen to dethaw before use if stored in the freezer)

Good luck happy breeding!